I personally would like to be able to vote. I find the beta seemed to favor First Light over the others, but seemed to get stuck picking the same map or two repeatedly. One day while paying the beta I played First Light at least 7 times in a row before I said, "enough is enough!" and went back to PvE. I didn't even know there were 4 maps at first as I only ever played First Light and the map on Venus.
Comment you reasoning below!
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Besides the Iron Banner periods, Venus and the Moon were the only available maps in Beta so those were the only to rotate thru. Full release will add a few more so I wouldn't worry about diversity. As far as seeing the map before, I think the current screen on zoning in is effective as you travel thru space (or continue in orbit) and then it announces the map.