Sometimes less is more. I've come across reviews classing that as being a poor episode, but that seems unfair. Troi's floating bits are awful, but the rest is atmospheric and has a real feeling that for once the weirdness is genuinely affecting everyone. They all lumber around with dulled senses and you end up feeling the lethargy.
I'm still glad they didn’t come back to it though. I'm not sure what else they could have done that wouldn’t have ruined the creepy feeling.