Mine is that I'm finding that the toolbox has been greatly expanded. I'm in the process of building a new version of a complex database and am enjoying all the new capabilities that I can add to the old. Yes, here and there I find something I liked is gone but I'm finding plenty of new options and workarounds that lead to a better result.
Do keep in mind that Panorama X is still evolving - and rapidly. Many of the menus you refer to have been recently restored and I suspect more are coming. I'd be happy to see the menus with commands and functions restored to the contextual menu on procedures. That's probably one of those you're referring to.
Don't give up though. Panorama X is very promising. Hang in there through the learning curve and I think you'll find it to be worthwhile.