Well, it looks like this thread is indeed undead, so I'll chime in as well with a few observations:
1. Rae lakes is crowded in the same manner that San Diego beaches are crowded. And why is that? Because (a) SD beaches are bare ribbons compared to super-wide Orange & Los Angeles county beaches; but more importantly (b), no one ever seems to consider Arizona! That's right, if you live in Phoenix or Tucson, what's the straightest, most direct route to the Pacific ocean? I-8 baby.
And so, SD tends to be a mad house in summer, more so than OC/LA if at all possible, because you need to add SD residents + people from two large metro areas in AZ who are intent on getting out of the desert.
Now, consider the Bay area - it has two prime routes to the High Sierra: Kings Cyn & Yosemite. Yosemite is a well known clusterf**k in summertime, and besides which, the vast majority stay in the Valley proper. That leaves Kings Cyn for those fresh from their local REI store who want to get out and experience backpacking.
And what is the primo, #1 hike out of Roads End? The Rae lakes loop. The problem with RLL is it delivers big, beautiful scenery, including running rivers, lush forests and sparkling Alpine lakes on an easy, well marked trail. So who can blame anyone for wanting to go? The problem of course is you'll think you're in SF proper - Rae lakes is one of the few places in the Sierra which has a time limit on the number of nights you can stay.
For people who live in the Bay area, and need their Sierra fix, then RLL is an obvious choice. But for anyone coming from out-of-state on a bucket list kind of trip, the much wiser course of action is to approach the mountains from the East side trailheads if at all possible.
As far as preferred THs, I'm in agreement with Ska-T further up-thread, with a slight alteration: perhaps the biggest secret in the Sierra is that you can almost always get a walk-in exit permit out of Whitney. What that means is you can enter from Cottonwood, (New) Army pass, Kearsarge or even Shepherd, cruise along the PCT/JMT (or Miter as suggested) in perhaps the biggest country in the Sierra (highest peaks, double range - Great Western, highest pass - Forester), and then, just to top it off, have a snack on top of Whitney and walk out.
Now sure, Whitney is going to be crowded, but it's (a) the last day of the trip (if you're doing 15 mile days); (b) no one is camping on the peak (well, maybe a few), so it's all very transient & cheerful; and (c) there aren't any casual "party" hikers - people put in the time to train either for a day hike or overnighter. Most have a look of determination, especially those who spent months of rigamarole going through the lottery process for permits, etc.
There are a many other multi-day hikes out of the eastside that cover impressive territory and seem to miss the great bulk of foot traffic. TI lake from Silverlake, Duck pass to Tully/Silver from Mammoth, etc. Ask a few questions - all the regulars have their favorites and could provide some insight/tips.
Here's a shot taken from Diamond mesa looking towards the Kaweahs with GW divide in the background & Colby pass off to the right - no one around anywhere: