I have flown on more than 60 airplanes. I'm fine as long as I sit near the window or near the aisle. I like the take-offs, except for the change in pressure. It's especially fun if the plane has an extreme angle of attack while taking off. On trans-atlantic flights, I make sure to have a good 600+ page book and usually read the entire thing in that one sitting, making sure to get up every hour or so to walk around.
I flew first class once (paid for by the company my dad worked for at the time) on a flight from Arizona to Michigan... It was awesome; they even served cookies and creme ice cream!
Sometimes it's nice to just look around the airplane and observe other people... A quarter of them or more will usually be reading some self-help book or the like: How to become a better business owner, or Investing for dummies, YOU: The Owner's Manual, The 7 Habits of Highly Effective People, How to Win Friends & Influence People, Getting Things Done: The Art of Stress-Free Productivity, and so forth.
An eighth of the passengers are usually doing some sort of business activity like making a presentation or making some notes on this or that, or making some spreadsheets, or sometimes managing a budget.
Another eighth at first glance will look like the previous eighth, but are actually doing nothing productive. These people are glancing over a presentation without actually doing anything or even thinking about that presentation, or they are flipping through notes without even looking at them, or messing with their PDAs without doing anything on them whatsoever other than going through various folders. Sometimes to add to the effect, they pull out their PDAs, Smartphones, and Laptops all at once, and then order some club soda. While drinking the club soda, they make faces which make it obvious they are not enjoying the drink whatsoever.
What I have said so far makes up half of the entire plane. An eighth of the remaining ones are preoccupied by their child, another eighth are reading some real book. In the most recent flights, an eighth are solving (or trying to) sudoku puzzles. The last eighth are either doing nothing, or they are just listening to music.
All of this of course changes when a movie comes on.