Without the aid of Cosmic Power, most decks cease to draw cards other than their beginning-of-turn default pick-up, and then they fall apart
Just remember that it only works for permanents you control (it doesn't work for your opponents' stuff), and that it only works with time counters (other types of counters are unaffected)
The most notable differences are in card quality, rarity, value, sizes, and pull rates
Decks like Heliod, Teshar, Oswald and maybe even Light-Paws are very focused on tight lines that aim to close games fast with combos
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Ultimately, I think unlocking the true potential of the Smiling Flood as a commander will require a significantly different decklist