That is fair enough, and certainly a...controversial question. Personally, I would say it highly depends on your Dancer, and whether or not it can really pull enough weight to make up for endless rain (which is a saving of one turn for every time the weather is changed). I would say that generally, for a HO team (which I assume is what you want given you want SS'ers), it's not a huge loss to run a Dancer, as last I calculated, it only costs you an extra turn before you really should be about done.
With Drizzle:
Turn 0: Rain is up (I.e. it's up before any moves)
Turn 1: switch Toed for something else.
Turn 2-x: attack under Rain.
Without Drizzle:
Turn 1: Set up Rain
Turn 2: switch for a Swimmer.
Turn 3-10: Attack under Rain.
Without Drizzle, using a Dancer that can attack well under Rain (E.g. Double Dance Kingdra?)
Turn 1: Set up Rain.
Turn 2-9: Attack under Rain.
Really, you only slow by one move, but you also don't have to worry about making Toed slow (slower than other starters to ensure your Rain is set up). Running a Dancer that can also ause Rain itself actually saves you a turn as compared to using Drizzle (and was the main reason i was against Aldaron's proposal, but thats discussion for another time). And really, if a Rain HO team hasn't wreaked havoc by turn 9, you're either up against very effective stall or very unlucky. I'd say most of the time by turn 9 you'd have hit hard enough to not be absolutely reliant on rain.
Let's not forget either that this is all assuming one could even use Drizzle plus SS. Now that Aldaron's proposal is up, that's not even possible. I'd say it's worth trying, to use a Dancer, but you'd need to pack something that can work outside of Rain, something bulky enough that the speed boost isn't a necessity but a bonus. Perhaps a...Bulky Kingdra? I don't know, just something which you can fall back on should Rain cease after turn 9 and the opponent hasn't been ripped to shreds yet.
