Having guys spend too much time looking for a lost ball. And when it is not cart path only guys not taking any clubs out to their ball, instead they go out get the distance,back to the cart,get their club and walk back to the ball.
I use a center shaft Heavy Putter. Too heavy for my partners but I love it.
I also have an old Taylor Made Spyder and a new Pyramid putter. The Pyramid has a nice feel but I don't think it lives up to the hype.