Hey! Who let that easterner in on the Chef Bernard's secret?! Well, I gotta second the notion, its a great spot. Bernard used to be the premier chef across the road at the Chateau Whistler, then decided to open his own little hole-in-the-wall cafe. Everything is wonderfully unique, and portions are ample. For a more traditional buffet breaky, try Portobello or the Wildflower Cafe in the Chateau. A breakfast bagel or burrito at the Rendezvous on Blackcomb with a fresh-ground premium coffee is a great start too.
You won't find bargain Vegas-style all-you-can-eat greasy hog farm breakfast buffets at Whistler... thank god. No Denny's, IHOP either, though there are unfortunately a couple McBarfo's. West Coast Canadian eating tends to be a casual atmosphere, and non-traditional fresh food creations with liberal use of herbs. Prices tend to be realistic, but not a giveaway. But heck, if you're a yank, everything's a giveaway for your buck anyhow.
Have a great trip, and we'll pray for snow for ya!