Allright, let's make a deal, I'll give up my comfortable roomy seat to a taller person, and every taller person will give up their seats in front of me when at the theatre, at the movies, at a concert etc.... Is that a deal?!?!

Hopscotch, what you say is so true (& humorous too!).

lyb,
Deal. I often extend this courtesy in theaters anyway. Always if I am directly asked to. As I may not run into you personally, I will offer this kindness to other strangers I may encounter in these situations.

I find the knee defender pretty much offensive.

www.safelanding.net/seating/seating.html
has a comparison of the seating arrangements in various airlines.

The trouble with some exit row seats is that, whilst you may have plenty leg room in front of you, the seat dividers are not collapsible, so there's no option to stretch out sideways, when my husband gets up to stretch his legs, for example...