An excessive sized boat is a boat bigger than yours
The bridge at the Basin has a 5.8 feet of height clearance so many boats cannot fit.
In general the Moultonboro, Tuftonboro side of the lake is much quieter than the Meredith, Weirs, Gilford side. The towns with public docking tend to attract more boat crowds, that includes Meredith, Weirs, Alton, Wolfeboro, and Center Harbor.
A lot of marinas and boats are docked in Meredith, Weirs, Gilford area of the lake and some popular boat destinations (Braun Bay, Johnsons Cove), are on the other side. So if your place is on one of the popular paths between them, you will get more boat traffic.