I grew up playing everything....baseball, football, BASKETBALL, skateboarding, BMX racing, tennis, ping pong, pool, floor hockey, soccer......my mom worked at rec center so I spent all my time there playing with any ball I could find in every league there was. Only played basketball and football in HS and college. Still play basketball and always will...
Didn't start playing golf until after college.
Right now it's just GOLF, some basketball and working out, if I run I run sprints only.
It's hard for me to say how much playing other sports helped my golf game. I'm sure my touch and hand eye co-ordination got a head-start but I can't imagine it being any other way. I grew up on Clearwater Beach in a house with NO A/C. Staying inside all day wasn't really a comfortable option. Hated it at the time but looking back I wouldn't have it any other way. If anything I think learning how to play golf has helped my skill set for other sports FAR MORE than the other way around. Golf has given me even more flexibility, balance, fast-twitch strength, strategy, visualization.........