It really should not ruin your forehand to play pushers. You have all day to setup and move the ball around. There is a guy who slices like crazy and is really good in my club. He knows I love pace, so he gives me none, and that is ok. I can still drive the balls to the corners and crash the net behind those shots. That is how I have to play him. He can get you on a string chasing down all kinds of shots so you have to have the footowork and variety to counter that.
A lot of people complain about it, but it works for him because he has incredible hands and knows the game so well. He knows everyone sees topspin and rarely sees slice anymore. And that is why he does it.