Just done Prague to New York and Los Angeles to Amsterdam last weekend. Prague to NYC was atrocious - paid for a supposed 'comfort seat' which actually seemed smaller and more cramped than the regular ones. Delayed two hours taking off as well so everyone on board was a bit crabby. The guy next to me, an American, was on his cellphone when I took my seat, and because I spoke Czech to the stewardess (who had spoken to me in Czech first), assumed I was Czech, and said very loudly to whomever he was speaking to on the phone 'yeah and to make it worse they've put me next to one of these Czech sluts, really ugly one'. He proceeded to then be as rude as hell to the cabin crew as well.
I always try to get an aisle seat on a long haul flight because then I can stretch my legs out to the side of the seat in front, and also I can get out to the toilet or for a walk whenever I want. It's really hard to sleep though and those cushion things for your neck don't work for me. Plus just as you drift off, it's drinks time or meal time or someone stomps past the seat and wakes you up.
It is very very dry on a lot of flights and you find yourself going mad if you don't have a bottle of water to hand. And it can get really cold sometimes. Last few flights I've been on, even the long haul ones, have had really bad turbulence as well, so we've spent most of the time with the seatbelt sign on, not supposed to get up and wander about (though people do). If it's a night time flight they dim the lights in the cabin so quite often people are sitting sleeping in the dark, or just a few wee reading lights on, then the dim ones to be able to see in the aisle. One thing I have noticed, flying quite regularly, is that now people tend to use these wheelie bags for hand luggage, the flight crew type bags, there is very little space in the overhead lockers, and it takes ages to actually get to your seat because you have to wait for those people to drag their little bags along the aisle (guess what my current bugbear about air travel is??
) so a lot of the initial 'getting the plane ready for takeoff' as you get seated is trying to find space for everyone's luggage, quite often with people having to put their case like four, five rows away because the lockers are full of such big bags there's no more room.
Amsterdam flight was not so bad because it was KLM, so we had individual TVs in the back of the seat with entertainment you could choose, rather than just having to crane over the seat in front to see one of the screens in the ceiling, and also the guy in the seat next to me didn't turn up, so I had much more space. A lot of turbulence on that one too though and the fog was so bad at Schiphol that we didn't even realise we'd landed, thought we were still in the cloud cover, until the plane slammed on the brakes. I've noticed KLM tend to feed you rather a lot on a long haul flight as well, more so than some other airlines I've flown with, who give you snacks. They actually give you like sandwiches and stuff as well as your meal. People were really bad tempered on that flight as well though because it was nearly full. We had one comfort seat available up front and people were fighting over it (it was 170 euro, so I wasn't fighting!)
Few months ago I also did London to Vancouver, which was a pretty long one, but weirdly I don't remember that being as uncomfortable as the shorter flights.
One thing I do love though is the little graphic you can get on most flights with personal entertainment, where you can watch where you're flying over and how long it is til landing. I like knowing where I am.