I've been in the deepest of pow and thoroughly enjoyed myself. At the end of the day, though, I still long for the speed of groomers - especially icy groomers. Once an ice coaster, always an ice coaster.
And before anyone pulls the "if pow isn't fast enough for you, you have to go steeper" bit, I would still rather just go steeper (think winch-cat) on icy groomers.
Of course, a perfectly sculpted halfpipe or superpipe beats both in my mind.