What do I like about playing bass?
1) basses -- several of them. As I've said before on this forum, I tell my wife my basses are like having a bunch of girlfriends. They all feel and sound different, but they're not as expensive and they don't talk back at you. No divorce necessary either!
2) the feel of the 'thump'. Tonight I was learning Train in Vain by the Clash. Heard it on the radio the other day and it just grabbed me. Been a long time since I heard it. It's a fairly simple bass line, and I got about 85% of it down, minus some timing, in 90 minutes practice. The whole time I played to a YouTube video, I could just 'feel' my bass against the song. And like banging on the kit, it just feels great!
3) the way it 'drives' a tune. Music would sound lifeless without it, like a missing heartbeat.
4) that, unlike drums, I can take it, headphones and a headphone amp and play on vacations, camping trips, etc.