Dove it a couple of summers ago with Dive Winnipausaukee, the boat captain had spent summers on the lake as a kid and had an incredible amount of local historical information.
On our dive was really pretty nice, lots of sun, half the boat visable at a time and covered in huge bait balls of curious fish, not exciting but a really relaxing dive. I agree that the boat traffic there is heavy and some aren't too bright. We had one guy drive between the boat with a dive flag up, and a bouy with a dive flag on it 20 feet away.
We also dove the remains of the Navy underwater laser test site, visability there was more like 40-50 feet and we ended the dive exploring an old sunken pier nearby.