Yeah I agree with this actually.
Love Tool, their odd timings and polyrhythmic drumming are brilliant. I would however argue they're less comparable to Pink Floyd due to the nature of their slightly more aggressive sound. Looking forward to their new album though!
They're one of the great bands in my opinion, even if they did ruin all other music for me for about 5 years straight xD
I get what you mean about there sound though. You look at stuff like 'Undertow' and 'Aenima' and it's so incredibly angry (and dare I say less accessible) when compared to something like 'Dark Side Of The Moon'.
I think TOOL's tunes are more mature in terms of how straight laced the lyrics are. Take something like 'Sound of Muzak' and compare it to 'Hooker With A Penis'. Hooker is just so much more direct and honest imo. Though I can appreciate that's more a subjective point of view. Though, I think you have to admit that the lyrics to Muzak are... cheesey at points xD
I think that there aggression is appropriate, much like how a lot of Floyd's stuff is quite mellow following the hippy movement and such, despite what the themes might be.