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This is a known bug; see Trac ticket 9708. As mentioned there, the problem is that the keyword "mesh" isn't getting passed on to show. Until it gets fixed, you can use the show method explicitly:

plot3d(sin(x-y)*y*cos(x),(x,-3,3),(y,-3,3)).show(mesh=True)
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use example from OP

This is a known bug; see Trac ticket 9708. As mentioned there, the problem is that the keyword "mesh" isn't getting passed on to show. Until it gets fixed, you can use the show method explicitly:

plot3d(sin(x-y)*y*cos(x),(x,-3,3),(y,-3,3)).show(mesh=True)
var('u,v')
f=[u-u^3/3+u*v^2,-v+v^3/3-v*u^2,u^2-v^2]
parametric_plot3d(f,(u,-7,7),(v,-7,7),opacity=0.7).show(mesh=True)