If I decide I just want the reverb to be very dry on a guitar track, I can't accomplish that without making it dry on all of the other tracks too.
I think we're probably talking about different things, here. Or at leas I hope we are.

Let's say you want a higher-quality reverb on a particularly important track -- just the vocal, for instance (as an example).
Bring that track up in Sound Forge, find the verb you want, process it 100% wet, save it as a different file (like vocalreverb.wav or something).
Now bring that reverb file up in your multitrack software -- let's pretend it's Sonar. You've already got your unprocessed track up in your project, 100% dry. Now bring the fader on your vocalreverb file up slowly until you get the desired mix of wet versus dry.
Yes, it's an extra pain in the ass. No, you can't adjust the parameters as easily. But it sounds like a thousand times better than your reverb plugin. It just does, and that's the tradeoff.
I want it to sound good and be easy to use.
I hear ya. I'd also like my girlfriend to be as hot as Halle Barry, rich like Oprah, good around the house like Martha Stewart, nice like my mother . . . AND be a nymphomaniac.
Unfortunately, in life, we have to be willing to accept sacrifices.
I'll be happy, for instance, that my girlfriend IS hot like Halle and nice like mom, and I'll work around the rest.
Making it faster won't necessarily make it sound worse.
Unfortunately, for whatever reason someone obviously hasn't figured that out, or I'm sure it would have been done already. Personally, I think it's not unlike a miracle that a $1000 and under computer can do the things it already can do, music-wise. Let's not get greedy and push things. Perhaps it just isn't a profitable enough endeavor given all the piracy and what not (?) Either way, I'm happy (read: thrilled) with the options available, even given their limitations.
To be honest, there aren't many reverb boxes I like the sound of at any price.
I have to agree with you, there. Reverbs tend to date music; like you can almost spot what era a recording was made in just by the type of reverb used.