I remember not being able to create an account because the website password validation regex was buggy, I wrote an email about it and it's probably still not fixed. I've had to read the "compiled" js of the website to understand what was wrong to begin with.
I've had administrative processes slightly deviate from the happy path and getting stuck. When you talk to a human now. it's sorry can't do anything it's all online even when you explain that yes you tried other possible contact channels phone,email,in person, etc (email seems to go to /dev/null or get a canned response that clearly didn't read your message).
"Computer says no" is more and more of a thing now here in france. it's faster when you on the common happy path but if you aren't you better pray. Also the different services still seem unable to talk to each other even when they are in the same building / same administration but different department. Hopefully they'll improve that in 20 years.
Highly optimized for the happy path, which of course does cover 99% of cases, but you better not be in the 1% :) That's what I liked about France: nobody expects you to be normal, so everybody is used to working around systems. For the Dutch (and Germans), systems are sacred, and if they don't work, it must be you!
Edit:spelling and clarification on intake
Also if I remember at Tergooi MC you needed to register in their system anyways before an appointment. In the past they issued a little plastic card at the very same booth.
Inside the hospital itself you should be fine with an EU ID card or a passport, I don't think they specifically need a Dutch ID.
France also seemed further along digitizing things.
Total duration is probably still a tie: it's all over the map but things can take ages in either country.
The Netherlands is great, except when it isn't. If you ever get stuck there, you have no chance convincing anyone. Their believe they have the best (civil) service doesn't help, but it turns out its all highly optimized for 'normal' Dutch citizens. As soon as your deviations from that norm start to add up, you're going to run into unhandled edge cases, which people won't handle (no protocol, and they are not used to using their own brain). "Computer says no" is Dutch (civil) service in a nutshell.