If I had time to practice and play I'd go to a pro. But people I see that go to pros aren't any better than people who don't, but they get angrier when they mishit. I figure I only play a couple times a month and don't practice so I have zero expectations and am able to enjoy myself on the course. In fact I'm playing the best golf of my life right now because I figured out I just have to keep it on the course and I'll at least get a bogey. I'll have one triple a round, a birdie or two and shoot low 80's. If I could eliminate 3 putts I'd shoot upper 70's. Why go see a pro?
Now, when my 4 year old took up the game I bought a package of group lessons through a female PGA pro for my son, my father in law, and myself. Totally useless to me and my father in law but my son learned a classic golf swing and is a terrific little player now. I think for kids or somebody just starting out finding a good pro is essential. But in my situation where I don't maintain a handicap, probably play less than 20 rounds a summer, don't even carry 14 clubs, I doubt it would help anything.
I would like to putt better though. Not awesome, just no more three putts. Then I'd play people for some $$$.