I’m 5’5” and don’t really need extra legroom. My husband is 6’2” and it really makes a difference for him. So for a long time we’ve been paying a little extra for more leg room.
Recently we’ve been reserving premium economy seats for around $200 more. For two people and two flights that adds up to a significant sum. However, I think it's worth it. I like the extra width along with the legroom, priority boarding (so we can be assured of room in the overhead bins), and not having to wait in the long lines at the counter. We are 68 and 70 now, so it seems like the time to do it.
I’d leap on business class for $500 more if we could have lay flat seats on the outbound flight since they’re always at night. I’ve never had an opportunity to try them, but I gaze at them with longing as I pass by on each flight.
For flying back home in the daytime, I might consider an upgrade for $100.