We saw this with the intro of Gnome Shell, which fractured the community between the old Gnome UI and new UI.
If we continue to split up when something new is introduced, we are doing it wrong.
The things I mention however are things I have found to be actual problems in my workflow.
They obviously work well for others and I respect that. I hope others can respect my observation that with Mac/Unity alt-tab more keystrokes or waiting might be necessary.
It is also an objective observation that with Mac style shared menu on top of the screen in a dual monitor setup you will sometimes have to move the pointer across two screens to reach the menu, then back again to continie working.
Used to Alt+tab would simply cycle through in order of most recently used. Now they've got some functionality where shit can inject itself into that list so alt+tab and then alt+tab back and then alt+tab back to bounce between two different programs doesn't work consistently anymore.
I'm sure I just don't understand the use case for the new behavior, but it drives me bonkers.
I also hate, and I mean HAAAAAAATE when text editors autocomplete matching brackets, single/double quotes, etc. It completely fucks with my flow.
so maybe I'm just an old control freak.