I never played on a gigantic map, I'am afraid starving in pijama for about 30 days by doing so...What I mostly liked in Tom's diary is the idea of making your people happy with let's say less taxes and this is what I'll try next to find out about the benefits. Shouldn't over populate the planets, that's true, but a high moral generates cash as well.
PS: SimCity4 fan too: less taxes for the rich, so let them come in your city...