Until I had only one workable arm and hand, I didn't know how wonderful two arms are.
Here are some of the simple things I miss being able to do:
scrub things well like pots and pans -- if you can't hold the pot in place with one hand and scrub with the other, Brillo doesn't do much good. A lot of the difficulty with having only one usable arm is that you don't have another arm to hold something in place.
cut up vegetables
unscrew jar lids
wash my two hands together under the faucet
plump my pillow
wring out a face cloth
tie an apron
If the good arm has an itch, you can't scratch it!