We have 29 tenure-line faculty in our department. These are the folks for whom service is one of the requirements of the contract. (Our adjuncts sometimes generously do service, but it can't be part of their contract and thus they can't be evaluated on their service. We have some other folks who aren't tenure track but do have service in their contracts.)
With our current committee structures, we have 64 positions in different committees that are supposed to be filled by tenure-line faculty. The chair, and two other faculty members in the 29 count have re-appointments that mean they sit on some committees by appointment, and so don't sit on other committees.
So, that's 26 bodies to fill 64 committee slots. (We have a couple other folks who are partially re-assigned to the big marble hallways of administration, but I'll include them in this count.)
We've totally done this to ourselves. And yes, we approved a new committee in the past year, one with five slots. A few years ago, we approved a different new committee with five slots.
Note: the slots don't include search committees or college/university committees.