Glissading, the skill of (mostly) controlled sliding down a snow slope either sitting or standing, can be a lot of fun and save you time and legs on the proper slope. Pacific NW routes where this can work well include Mt. Hood south side, Mt. Adams south side, the Muir snowfield on Mt. Rainier, and various routes on Mt. Shasta.
Beginning climbers often learn this technique on day 1 of snow school, and then mistakenly think that it's something to be done at every opportunity. (And, hopefully you learned this on day 1 of snow school as well, but it's worth repeating: never glissade with crampons on!)
However, glissading has some serious downsides, and saving a few minutes on the descent may not always be worth it. Before you glissade, consider these points:
Much greater chance of injury than simply walking (usually a broken/sprained ankle, going too fast and cratering into a rock, talus or scree, or dropping into an unseen crevasse)
You wear out your gear faster (seat of your pants and pack bottom)
You get your butt wet
You can lose gear strapped to the outside of your pack, like trekking poles and crampons unless it’s very well tied down
Questionable time savings – saving 20 minutes on a descent by glissading may not mean so much when you weigh it against the downsides mentioned above, and the fact that a round trip climb may take 8-10-12+ hours.