Cursor did this IDE -> Agents transition very well.
Cursor still supports both the IDE and the Agents window, open at the same time, in the same project. I frequently use both and switch back and forth between them. They also link to each other from the top bar and right-click context menus so you can switch to one or the other seamlessly. Best of both worlds. Switch back to Cursor.
This would have been the proper way to do it, but it would have taken work, and Google really hates migration plans of any kind. Better to drop the 2.0 on users' heads out of nowhere and just move on.
Cursor still supports both the IDE and the Agents window, open at the same time, in the same project. I frequently use both and switch back and forth between them. They also link to each other from the top bar and right-click context menus so you can switch to one or the other seamlessly. Best of both worlds. Switch back to Cursor.