I posted this video after our Thanksgiving trip, it will give you a very good idea of the problems with scanning:
http://youtu.be/gnutHcc8tbk
Of course there will be one poster who will be along shortly to tell you the line moves quickly and you shouldn't care about another line to get into line..
This is a fair representation of the length of FP entrance lines when we were there 3 weeks ago.
However, this FP entrance is staffed better than what we experienced. When we were there, most FP entrances only had 1 CM, who was trying to watch both scanners. The results were what you would expect. If anyone's scan turned blue, the CM would have to focus on them for a moment. While their attention was on that person, other people would flow through the other side, including people whose bands also turned blue, but the people didn't get stopped by the CM who didn't see the blue. Also, blue scans would flow through when the CM was distracted by people not in the line (as shown in this video, when a guest pushing a stroller walked up to the CM and started talking to her - you can see the CM trying to be courteous to this guest, but struggling to watch the scans and her iPad at the same time). Anytime the (usually lone) CM was distracted like this, floods of people went down the line with either blue scans or no paper passes or not the right time on their paper passes. The paper ones usually got booted by the inside CM. The blue scans would talk their way past the inside CM by saying the scan worked outside.
So I guess if they have made any improvements in the last month, it's that there were 2 CMs at that FP entrance in the video. When the guy CM walked off, he was instantly replaced by another person. Hopefully there are 2 everywhere now.
And yes, there were always, always line cutters, especially in the "spontaneous lines" outside the FP entrance. Inside was just as bad sometimes. One night at POTC, after we had passed the first scanner, some people actually climbed over the ROPE switchbacks outside the front door of the building and jammed their way in between me and my family. I had to shout to my husband to get him to turn around and make them let me through. (My bad for leaving 1 foot of space between our bodies, I guess.) It was nuts. I don't even know if they had fast passes - for my sanity I ignored what happened to them after we got our family together again.
Also, we found the design of the FP turnstiles to be kind of bad. Yes, two people are supposed to go through at once. In practice, though, the following is true: Some people are not space aware and take up the whole area; some people are Pooh sized and take up the whole area; some people have their bands on in such a way that they practically pretzel up like a Cirque performer and take up the whole area. It was only perhaps 50% of the time that both scanners were in use. I suppose it's still a "win" if you consider that with only 1 scanner, only 100 people get through in a given space of time; with 2 scanners, 150 can get through (instead of the ideal 200). The only way I can see them fixing this problem is to put the scanners a little further apart, and install a small bar between them so guests understand "this half is your space".
We found the design of the scanners at the front of the park similarly bad. Yes, they are usually in a V shaped formation with four scanners available in the V. Most guests are sadly oblivious to what's going on and stop at the outer scanner, preventing anyone from using the inner scanner (thus slowly the whole line down), even when a CM is trying to get them to move up. Other guests are too hesitant to walk around someone stuck on the outer scanner to get to the available inner scanner, even with a CM waving them in. A LOT of guests have "personal space" issues and hesitate to go stand beside a stranger, and will wait even though a CM is gesturing them in. It took us longer to get into the park at rope drop (i.e. a crowd) than it used to at rope drop. When we entered later, after rope drop, when there were no lines, it was easier than old tickets because there were plenty of open scanners and CMs standing around. People weren't having "personal space" issues when it was empty.