I deal with large field groups all the time and I’ve been there, but only when I realize that really need to do something a different way. With fields collapsed each field shouldn’t be taking up the entire screen.
I can’t say that anything easier is coming but I will bring this to the attention of the developer.
I have a couple of suggestions, don’t know if they’ll help.
The first is to do a bit of planning. I’ve been known to spend several hours just planning how I’m going to build field groups that I know are going to be extremely large.
If you’re creating new groups at the end and then dragging them to where you need them it’s much easier and faster to duplicate a field above where you want to put the new on and then alter it to suit you needs.