Have you ever played Morgana mid? The concept relies on using her W to score minion kills from afar. Basically, starting around level 5 she can wipe out 4~5 minions with one spell. And then since it's mid lane, your tower kills the enemy wave, and the lane resets. This way, even though you're pushing, you never push up.
The concept is even easier to achieve if you take two champions mid. For instance, Soraka and Galio. Starting at about level 3, you can instantly wipe out entire minion waves even more effectively, literally getting 100 CS by 10 minutes without any effort at all. All that's needed is an AD that can handle a 1v2 lane on bottom. Caitlyn does this quite well, since she has traps to replace wards, an escape ability, and long range to last hit with. Even though she's alone, she will be leveling quicker which will help in the long run. More levels = more AD.
Since there's 2 characters mid, it's still easy to take dragon after a kill elsewhere on the map. Furthermore, Soraka can cover mid while Galio goes to roam, or else roam the map herself to drop a heal/ward here and there. In fact, mid is the ideal spot for a support, since it allows them the easiest access to ward the rest of the map.