Sean:
I have heard and read about the stymie rule for a long time, but it was particularly fascinating to read an account of Bob Jones' early-round upset loss in the 1929 US Amateur. In seventeen holes, three holes were basically decided by stymies. I doubt it happened quite that often in a match between B players, but good players could use the rule to their advantage on the putting green by lagging to the appropriate side of the hole, and apparently they did so with some frequency!
However, the stymie was strictly a match play thing, and once most golfers started playing to post a score, it was seen as an anachronism.