I'm not a pool person either since I have one in my back yard. But the pool deck on YC is huge and never crowded and even has some shaded areas where one can sit and read the newspaper (you get a daily newspaper of your choice) in peace and quiet. There's also a food area and clever bartenders who came up with some interesting nonalcoholic drinks for me. I agree--the size of the ship is offputting. Luckily they have a separate gangway for YC, so it's possible to get back on the ship without standing in long lines. My biggest problem with them is they sail out of Miami--the drive there is the pits. And their itineraries are same old, same old 7-nights. And your status expires if you don't sail with them every three years. Given all that, I'm probably done with YC.
I will be interested to hear how Oceania goes for you. Cheers!