Yeah, there will be some busy days During the holidays, but it usually is not as bad as it is on a three day weekend like MLK. You can avoid bottlenecks if you plan ahead.
If you stay in town, ski out of Main Lodge. Main has a half dozen high speed lifts that keep the waits down. Canyon Lodge has one high speed quad, and can become a real mess. The parking at Main sucks. Try getting there early, like catch a bus around 7-7:30 am. Or, get there by say 8:30 and pay for preferred parking. If you do not need to rent anything, Chair 2 and Chair 4 both have limited parking, and are good places to ski out of, as long as you don't have any beginners in your party. Both chairs are on the way up to Main on Minaret RD. The traffic leaving Main is horrible, plan on spending 45 minutes in bumper to SUV bumper, or hit the T-Bar, Yodler, or Dry Creek Bar, and drive (designated of course) after 5 pm.
If you are staying near Canyon Lodge, try to get up early, and get a parking place, and be mid Mtn by 10 am. Don't come back until you call it quits. If you find yourself headed down Cloverleaf with a million other people on the run, and above on chair 16 (Canyon X), then do the following: Stay on the rt. side of the run, and look for Chair 22, ride it, and ski whatever looks good.
The new "Village" may be tempting as a destination. It is definatly to cool nightspot, esp. "Lack-of-Nookie", but it's new, fast, access lift drops you off at the Canyon Lodge mess (only 1 fast lift remember?). You could take the bus to Main, as the transfer point is right there, and some people will get off to go to Canyon. You will be standing.
The best place to stay may be at Little Eagle. The Little Eagle 6 person high speed chair is fast, and offers quick access to chairs 22, 25, and 9, all of which have great terrain, and are under used. Stay high on the Mtn, and avoid Canyon!
Keep in mind that the Sierra is notoriously unpredictable. Last year the skiing was great, with big dumps before Xmas. Other years have been 90% man made snow. Some mountains ski well on man made snow. Mammoth is not one of those places. If there is little or no natural snow, pumice can blow onto the runs, and turn them into sandpaper. A couple feet of natural will keep that from happening, but '99-'00, and '00-'01 both had some grim skiing duing the Holidays. On the upside, the skiing up top in the Wipes, and Drops is often excellent when the rest of the hill is marginal, as the wind blows in snow. The same is often true for Chair 3 gullies like Xmas/China Bowls, and Wes Bowl.
June Mt is a great, if flawed Mtn. It is never crowded! Really! Somehow, I got last MLK off, and my girlfriend and I drove the 20 min away from the crowds. The old slow access double presented the only wait of the day, after that, it was no crowds, no wait. But June is flawed. The steepest terrain is at the bottom of the hill, and will most likely not have enough snow to be open. If it is open, you will have to lap the old, slow (very slow and long) access double. There is lots of uncrowded groomed intermediate skiing (read: boring). There is also all levels of terrain parks, including hits for the 7 year old and the Rockstar. Snow allowing, there are two pipes, one big and perfect, and one tiny perfect one (way fun for anybody). June also has one of the longest beginner runs in the West, and some good bumps, and trees. It also has tremendous BC skiing for the expert with experience and gear. The real problem with June is that it has a "pit" in the middle, that prevents you from skiing top to bottom without riding a chair. Did I mention it is never crowded?
Hope to see you here! - spin