I can't speak for anyone else, but part of my work involves very large dataset analysis using an app analogous to boinc. For number crunching, the MBPs, even with 6 cores, and the iMP are either a joke (the MBPs) or grossly overpriced (the iMP). But they do look nice.
It's really about the correct tool - running a MBP at 100% 24/7 is just not what they are built to do, and they throttle severely (NB - the GPU being used at 100% at the same time contributes to the problem - the MBP design doesn't allow adequate cooling for that kind of sustained operation). That's part of why the cMP is still a useful tool - it can be run 24/7 - and the tcMP is not. I don't do any sort of video or graphics work, so can't comment on those, but for hardcore computing, Apple's lineup is a sad joke. And what frustrates so many is that it used to be at least competent.
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I still have a 2010 MP that I upgraded to dual X5690s (3.46 GHz Xeons). It scores ~1700, which is better than the E5-2697 2.7 GHz 12 core tcMP, which is around 1550-1600.