I have pretty much the same experience, but it is highly dependent on what you were using.

- WCF ? (very enterprisy i know) : you are still mostly screwed

- aspx ? compulsory rewrite

- MVC ? mostly smooth (but most of the pain is in initialization so comes early and can discourage newbies)

- Console ? mostly smooth

- before .Net 6 ? it was a death march, not only many API were lacking, but third party libraries were also missing.

- .Net 6 -> .Net 8 ? very smooth