I've flown 4 times (two round trips) since December. The smaller airport I departed from was a breeze, but the larger and busier airports are a lot more rigorous, which only makes sense. More people + more opportunity for mistakes = more vigorous security measures.
Of the 4 times, I was picked for the random FAA spot check twice. I never had any problems, everyone was nice to me, largely I suspect because I was polite back. I didn't treat the airline and security people as if they were trying to make my life more difficult or something. When I was approached by security and asked if I would mind stepping over to a secured area for a random check, I smiled and said "sure, no problem".
Just follow instructions, so many bad experiences could be prevented if people would just read the signs and follow simple damned instructions.