I can't add anything here that hasn't already been said, but hopefully numbers count so here's my input.
My first thoughts was that there was a graphical glitch as GUIDE turned dark and lost it's colours. Nilla informed me it was no error, it was intentional! I was so put off that I'll stay with V11 until the colours and clarity return or I'm forced to update. I did wonder whether I had just got too used to the way it looked, but I found it reassuring that I was not alone.
As for multi-line text editing...PLEASE PLEASE add this. Single line text it so awkward to write lengthy notes in the code I simply don't bother or keep it to a minimum which is a real pain when someone else comes to understand my code.
I'm going to avoid looking for the positive so I avoid the decision or whether to switch to V12 or not. Without knowing the Pro's it's a no brainer, V11 wins for me.