As promised, here are the results of the survey. There are 34 responses from pilots and 86 from controllers - probably because the link was posted here in the ATC forum rather than in a more pilot-specific forum area.
Answers from pilots
Answers from controllers
There was also a lot of written feedback, mostly along the lines that ATCOs and pilots need to interact more, have more fam flights/visits and so on.
Right now I'm finalising the paper itself, and I'll send it to those of you who provided an email address in the feedback form. You could also send me a PM if you want the paper once it's finished.
To everyone who participated, thanks for your time and input!