It can be. It's also very expensive when people are scattered across multiple states and even multiple countries. Basically no meeting with more than 2 or 3 people I'd likely be in would involve people only in one of my nearby offices.

In addition, while whiteboards can still be nice for certain things, over the past few years I've also come to realize that collaborative docs (e.g. Google Docs) are actually as good or better for a lot of purposes.