Went 10.17 & 18 - had a great time overall, but wanted to share one note:
I wanted a break in between houses that Thursday, so my mom and I headed over to Diagon Alley. I told her it shouldn't be that crowded (total lie that night - it was swamped). We decided to hop on Gringotts while we were there. In the 30+ times I've been on Gringotts (sometimes Express, most times not), I've never ever had to wait in the extended outside queue in the back. We waited in it for the first time that night. Definitely not a complaint, just something I didn't expect. I went the Saturday before Halloween last year and had a completely different experience (though it was raining last year, so that may have scared folks away).
Just thought it was interesting based on everyone's notes on crowds, lack of B&T, etc. Not sure what the solution would be, but I'm curious to see what they do, if anything, going forward.