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This is may not be a good answer explaining why is the Symbolic Ring not working here, but at least a workaround: froget about symbolic functions and use Python lambda functions instead:

sage: plot3d(lambda x,y: abs(x+I*y),(x,-5,5),(y,-5,5))

This is may not be a good answer explaining why is the Symbolic Ring not working here, but at least a workaround: froget forget about symbolic functions and use Python lambda functions instead:

sage: plot3d(lambda x,y: abs(x+I*y),(x,-5,5),(y,-5,5))
abs(x+I*y), (x,-5,5), (y,-5,5))

sage: plot3d(lambda x,y: abs(x+I*y), (x,-5,5), (y,-5,5), adaptive=True)