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IDK why they are greyed out unless you have already saved. I think that removes the possibility since step backwards, if I am right since I never use it, will take you back to your last save. You can save stages in your document as you go, then you can always return to one of those. The other thing is that cmd/ctl + z will as you said take you back one step. If you hold the ctl and the alt/opt key + z you can keep going back. The best way to go back multiple steps, IMO, is to use the history palette. I always keep it open under layers. I think the default is set to 20 steps which if you are making clone or paint strokes may take you almost nowhere. However, if you go into preferences you can set the number of history steps, up to 1,000 I believe. That should make your head spin! Go to preferences>performance>history states and up the slider all you want. I believe that the more history states you set, the more RAM you use, so just be careful with that. If your docs get to big, you could give yourself a headache. That is why I save way more frequently than I think necessary. Sometimes I forget and I hold my breath when I go to save . . .

Hope that helps.