Depth of field was somewhat shot to shit, I wasn't fast enough, colors ended up WAY too saturated throughout the entire picture (to the point where I couldn't do any decent post-processing - hence the awful crop job), and just a slew of other bullshit. I give myself a little credit, counting I'm 6'3" and I was hunched over a flower with a 2" diameter hendheld, but it still sucks.
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What tripod did you have? Why did you get rid of it?
Both those cameras also have the same processor (DIGIC III), which is one of the reasons you're not seeing a MP increase (not that actually completely matters in the long scope of things). But no doubt about it, it's a better camera (like you said, weather sealing = m/), and on top of it you now have 1/8000th shutter speed capability! Plus two extra AF points never hurt anyone.
The next upgrade you take - if you decide to stick with crop cameras that is - should be the 7D. That's my current goal unless the new 5DmkIII just totally fucking owns. even then it'll be a hard decision.