As alluded to in this thread, everyone told us there was no way steroids would help improve a batter's average, merely the power of the swing. Then all these players claimed the 'roids helped their eyesight, and improved their reaction times. No way steroids could help pitchers, though, since they don't need to be muscle-bound.....but, nope, again pitchers came forward and admitted that they wouldn't even be in the major leagues but for steroids.
So, could steroids help a golfer. Probably, but I don't know how much. If it improves your eyesight, then I guess it could help with putting and with gauging angles and distances for certain shots. Would it help a golfer's full swing? Maybe give them more power, but I doubt it could help hit the ball straighter....except maybe the extra power would mean one could swing easier and therefore be more accurate.
I don't know any of this for sure, because I've never taken steroids, I'm just suggesting that baseball players have already told us that designer PEDs can assist you in a lot of ways other than growing giant muscles.
As for Tiger, he has been one of the top players in the world since he was a teenager. He won 3 US Junior titles, and 3 US Amateur titles, and he was hitting the ball every bit as far as he does today. I doubt he was doing 'roids back then. And, while he has clearly gotten more muscular over the last decade, he doesn't have any of the outward signs of steroid use.
I do suspect he was doing something illegal with that Canadian doctor, though, probably to assist with his knee problems.