what's there to remember? NHibernate you basically use Linq, so if you remember Linq you remember NHbernate. The only extra bits are the setup and mappers, which are sort of trivial. The pain points come around because NHhibernate decides to lazy load everything or ends up doing crazy joins. But overall I found NHibernate not too bad, it certainly was fast doing a lot of basic CRUD type stuff.

However, these days I use Dapper.NET and SQL. Dapper gives a nice mapper for parameterized queries and maps results to types. I think it's a nice middle ground.