Although I agree that standing, on some days is very unappealing, I know I must, so do it with lots of leaning, in the shower and while drying off.

When I have one of those days, and need to towel-dry my hair (thankfully I keep it short - military short) - I will put the towel over my head, then lean my forehead on the wall, support myself with one hand on wall, towel rack or bathroom door-knob and use the other to just take my time rubbing the whole towel thru my hair until sufficiently dry...... no head moving involved. Note: I realize this may be difficult with some who have neck problems but it works for me, just a suggestion.

I used to be a rather fast bather, but now my shower times are rather long, due to taking time with all movements.