what do you guys use to cut the shape of your bows with after you lay out the shape?

A bandsaw.

I now use a band saw to cut out the rough shape of a bow if I am making it for someone else.  If I am making myself one I use the draw knife and rasp to take the area of the lines that I have drawn.  The grain of the wood will determine to some extent how the lines are interpreted.
Osage works really well with a draw knife.

BigArcher