The below is a layman's understanding, consult a lawyer for an expert opinion.
Under Dutch law, an NDA that limits your current or future ability to find work is not enforceable. You're already compensated through your salary, so an NDA that does not affect your market value does not warrant additional compensation.
People have different standards, when it comes to what you can and can't discuss about your work. The NDA merely serves to formalize and document the expectations of the company with regards to confidentiality. It might, for instance, limit you to certain devices (only company-owned) or communication channels.
If the NDA contains something you fundamentally disagree with and this section is non-negotiable, consider it a fundamental disagreement with regards to the terms of your employment. Find a different job.
Long Term Applicability
How will this NDA likely affect you in the future?
- You cannot cannot take any documents - not even your own research notes or code - if they were developed with company IP or on company time.
- You may still talk about past and current projects - you just can't name the client, internal business decisions, patentable work or details a third party could benefit from.
- You technically cannot discuss many subjects with your spouse or friends. Or external technical experts that have not signed an NDA.
- When you leave, you take all the skills you've developed and experience you've gained. A similar project means retracing your steps, but will take much less time.
- Not being able to name the client is not much of a limitation: When job hunting 'A large healthcare SAAS company in Kopenhagen' is fair play and uniquely identifies the company.
The burden of proof is heavy, under Dutch law. So even with an NDA, it's typically 'no harm, no foul'. You need to be either malicious or extremely negligent for a judge to approve your firing, or a fine.
The one thing that is often missing with these NDA's (and your contract), is a description of the process for getting pre-publication approval (for blogs or tech talks) or for working on Open Source projects at work - or in your personal time. If either is relevant to you, that's worth a discussion.