Actually Red, quite the opposite. Yosemite is designed to be a tourist destination, and so has all the appropriate infrastructure - campgrounds, parking, roads, trash receptacles and pick-up, sensitive areas are fenced and appropriately signed. If you've ever been there in the summer, you'd know what a circus it is- and how many people it daily serves, and how well the US Park service manages it. They really are very good at what they do. Moreover the park is gated - it can control how many people can get into the park. Pretty effective crowd control. May is still off-season. Kids are still in school, the weather is still cold at night and cool in the day, so the park, particularly mid-week, is not near capacity.
The race through Yosemite would be cool - like riding through a cathedral. A TT would be manageable, particularly if it were held mid-week. To all of you who pine for pristine nature, strap on the back pack and trek into the sierras. There's allot of space to get lost in.