How do you manage and mitigate slogan spammers?
Play dumb. Let me tell you the four words that every buzzword aficionado or consultant dreads:
What does that mean?
These types of slogans and mantras typically represent an ideal or an attitude, not a plan. Many have been so overused they're essentially meaningless. "Just do it?" You're all presumably in a meeting to "do it". Figuring out what to do and how to do it is presumably the reason you're even in a (virtual) meeting to begin with. "Think different?" If you were going to do what you've always done you wouldn't be discussing anything.
The point is not to challenge the slogan or statement, but to ask them how it applies to the topic you're discussing. Actually downplaying your own understanding can often work well here, try "I'm not sure I understand, I don't really have much [context on / background in / ...], could you explain how this relates to X?" Asking someone to explain is always fine, but this type of false modesty is a technique you should use sparingly though. It can appear condescending if you overdo it.
This should mostly take the wind out of the sails of people dispensing this kind of wisdom in an effort to be seen to contribute. What I think you're getting at is people who try to avoid meaningful examination of an important decision by saying to just "go for it". Those take more of an effort, but the essence is the same: buzzwords are not a reason for doing anything. The examples you gave can boil down to "let's just take a chance". That sentiment doesn't typically fly in most corporations which are risk-averse by nature, but couching it in buzzwords can often make people lose their heads.
The way you can address this is by bringing it back to substance of the issue. If someone is saying to "just do it" you counter by refocusing the discussion. You say things like:
- Are we then prepared to accept the risks X and Y that we discussed?
- So we're comfortable with the increased costs that this would entail?
- I'm all for innovating but* we're here because we wanted to make sure we understand the impact on [our customers / the IT team / ...}.
- Thanks for the energy boost Jack, but* I really do want to get to the bottom of [issue]
- I'd like to change things up as well but* I really think we should hear Sandy out on what she was saying about X. Sandy, what would you say was the main...
- I'm sure our customers would think very differently about us if the site went down and we didn't have a backup, so how can we...
Most of these require that you have a decent amount of capital in these meetings so that you're able to push back a little. That usually means either being at the same or higher level as these slogan spammers or being recognised for your expertise on a topic. IF that's not the case, stick to asking questions rather than controlling the meeting. As always, go with something that fits your style but also your company culture. The last one in particular is rather passive aggressive.
The Sandy example can be especially effective as it gives someone else the floor and can encourage them to speak up more. It's a great way to support less experienced colleagues who might lack confidence or can't get a word in, just don't overdo it.
[How do I avoid] sounding pedantic, contrarian, or even like an enabler?
As long as you're professional, don't dismiss people out of hand and it's clear that you're trying to get things resolved rather than "only complaining", that should never be an issue. In a way, you're deploying the typical 'old fart dismissing new ideas' response of "That sounds great, but here in the real world...". As long as you make sure you don't actually come across like that when you refocus the discussion you should be fine.
If you're in a team or organisation where simply trying to find a solution or challenging wishful thinking is negatively impacting your reputation, it's probably time to move on. Thriving in a company where slogan spammers are common or, even worse, in charge requires a very different approach and it's not one I have much experience with or patience for. It sounds like you don't either, but there are any number of reasons why someone might want to stick it out in a situation like that. It'd be a topic for a separate question though.
* As DanCrumb pointed out, a good tip is also to avoid the use of the word "but" here:
You can acknowledge that they said something and then just return to whatever was being discussed at the time. You can also use it as a signal that parts of the room are getting bored and try to nudge things closer to making a decision.
It's not uncommon for people like this to make a big deal of the word but (as in the "no, but" > "yes, and" concept) so even replacing it with a "though" can help.