Sitting in FRA now. Originally landed in MUC about 2 weeks ago.
Arriving in MUC was easy. The airport wasn't crowded and I was able to use the self-serve kiosk with no issues. I could see where this line would back up depending on how many planes land at the same time.
Flew into FRA from VCE. Despite the fact that I had my photo and fingerprints recorded in MUC upon entry, I still had to do it again to leave. There is some sort of "pre-registration", but it is same day only. And even if you pre-register, you still have to queue in the kiosk line, you just bypass the kiosk. Doesn't move you more than a couple people ahead in the line since the kiosks is a bottleneck.
Took me about 40 min to deplane, get to the terminal by bus, and make it through the line to the Z gates for my flight to IAH. This was at 745-830 am.
Thankfully, I did NOT have to go through a security check again.
My poor traveling companion was scheduled to fly VCE to IAD and they cancelled her flight in the middle of the night. She was rerouted through FRA with only about an hour layover.
Also, FRA is terrible for international layovers. Totally dominated by Lufthansa. Staff here are not friendly or helpful, except for the one lovely United employee I found after being rudely dismissed by three other employees.
Food options are awful. Only the Lufthansa Senator lounge, which has very restricted access. I don't think United Polaris can even get in there (unless you also have gold status or higher). No priority pass lounges. Can't find any charging stations anywhere. Not even a hook in the bathroom stall to hang my bag on.