I have taken to cold crashing my Hefe's. A day is usually enough, I'm not looking to drop ALL the yeast, just thin it out.
When kegging, the yeast tends to settle out in the kegerator, anyway. Plus, I think I get a better yeast selection for harvesting.
The beer still tastes great.
My latest Hefe, brewed with extract this time (Zymurgy experiment), went NUTS with Wy3068 and pretty much finished in three days. I plan to keg it Thursday, it will be 12 days old then.