I upgraded my MBP with a 256g Crucial SSD last year and saw immediate results in the responsiveness of the OS and Applications. Since similarly upgrading my 2010 Mac Pro to a 128g Crucial SSD about a month ago, I have yet to notice a significant performance boost aside from faster file transfers. It seems that each time I go to use the machine, all my drives must spin up before apps will launch or finder will open. I have disabled "Put hard disks to sleep" to no avail. I originally upgraded the RAM to 10GB, so I know there should be no need for writing to the disk. Any suggestions, aside from removing all the secondary drives? 
With this machine I have the following volumes:
Crucial 128GB SSD OS X Boot (Bay 1)
Original 1TB WD Caviar (Bay 2)
Windows 7 Boot Seagate 320gb (Bay 3)
Media Drive 1.5TB Seagate (Bay 4)
Attached via FW800:
LaCie 1TB - Archived Documents, images, other non-program files
4TB RAID - Redundant Time Machine backup
With this machine I have the following volumes:
Crucial 128GB SSD OS X Boot (Bay 1)
Original 1TB WD Caviar (Bay 2)
Windows 7 Boot Seagate 320gb (Bay 3)
Media Drive 1.5TB Seagate (Bay 4)
Attached via FW800:
LaCie 1TB - Archived Documents, images, other non-program files
4TB RAID - Redundant Time Machine backup
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