I have that exact disk (WD7500BPVT) in my late 2010 (bought it in September) 13" Macbook Pro, and it fits fine. No EFI problems when installing, just replaced the disk, formatted it and installed OS X.
Excessive head parking
I experienced the excessive head parking problem with this disk.
I resolved it by using the hdapm utility to set the disk's power saving settings to the least aggressive setting, which stopped the heads from parking, and it works just fine.
I had the same issue (with a different disk) in Linux on my previous laptop; I did an equivalent fix, and it has worked fine for well over 3 years -- so I'm not worried about the disk, but had I known this before buying it I might have chosen a different disk.
When I was googling around for a solution to this problem, I got the impressions that lots of disks behave this way, so I guess it's not just the WD Scorpio Blue. This is a very common issue with certain disks on Linux as well.
Advanced Format on OS X
WD says this about their Advanced Format disks on OS X:
Mac OSX version 10.4 onwards (Tiger, Leopard and Snow Leopard) can use the GUID Partitioning Table scheme (GPT) which will align an Advanced Format drive correctly. Mac OS versions using Apple Partition Manager (APM) will not align partitions correctly and will not provide optimum performance.
Basically; use GPT, and you're good.