Yeah, then the whole "assimilation is mind-rape, its the worst thing that can ever happen to you, but we're going to voluntarily choose to do it for a laugh then forget all about it next week" thing was taking the pee a bit too.
Also the Vulcan, the one with the strongest mental discipline of the lot of them, is the one that is overwhelmed....what?
None of them were really assimilated, their minds were protected from the deeper effects of assimilation (and before you say that this shouldn't be possible, don't you think Doctor Crusher's records of Locutus, Hugh and the EMH's own studies of Seven would've given them a better understanding of Borg tech that a temporary vaccination would be possible?).
As for Tuvok, his fully alien biology might've metabolized the vaccination out of his body faster than either Janeway and Torres.