It would totally destroy your ability to play golf, that's why the Nationwide tour and collegiate golf are scrambling to decide how to deal with the growing problem.
Barry Bonds discovered how the drugs hindered his baseball swing as well.
I think Barry Bonds and Tiger are two entirely different types of people. Tiger really is a quintessential athlete, he works harder than anyone in the game and, unlike Bonds, Tiger is a generally amiable person.
Steroids in pro sports are a huge and growing problem, testing on the PGA tour may already be a foregone conclusion, but I'll bet the farm that you never see Tiger fail a drug test.