For those who get "bored" of groomers (which honestly, I do too after a while), the key is to stick with the glades. A friend of mine hated BW until he did the glades, and the first day he did the glades at the end of the day he said he thought that was one of the most fun days of skiing he'd had (he's typically a Sugarbush skier). He ended up buying a house here. So, for those advanced skiers who for one reason or another find themselves at BW, I'd recommend trying the glades. Boundary Line is the gnarliest I've tried, and I've only done it a few times - there's a big cliff in the middle which I find rather unsettling, and I have to work my way around it because sure as hell I'm not jumping 10 feet into the trees below, but there are also some that I've looked at and said "no thanks". If you are on the Rosebrook Mountain side, all the double blacks are quite hard (and also I still avoid them) - Snowmaker, Inferno, Dark Star, Over the Falls, Mr Moose, Sierra Crest. They are all VERY challenging and easily accessible, but you have to know to look for them. Most people don't realize that such terrain even exists in Bretton Woods. It's the reason why Bretton Woods has as many acres of skiing as Stowe, while having only about half the trails by length.
For the "advanced intermediate" skier like me, the "single black" glades are awesome and as much of a challenge as I care to have. But of course, there's no snowmaking and it's very much subject to Mother Nature's whim.