Slow iMac/how to identify "other" files and folders

My iMac has slowed down considerably in the last 8 or 9 months. (OS 10.7.4) I get the beach ball on everything, whether trying to scroll through Gmail on the web, or switch from one application to another.  My photo library is very large (18,000 photos) and it's at a standstill most of the time.  Syncing my iPad can take 30 minutes. I'm working with Apple technician and have reset PRAM, done a disk utility check, and repaired permissions (there is still something wrong there). In the meantime, I'm trying to figure out why my storage is so high.  when I view "About this Mac" and "Storage, it lists Audio, Movies, Photos, Apps, Backups, and Other.   Is the other my Applications, as opposed to Apps?  Is there some way to get a listing of folder sizes?

How much free space is on the HD, where has all the space gone?
OmniDiskSweeper is likely the easiest/best, and is now free...
http://www.omnigroup.com/applications/omnidisksweeper/download/
Check the S.M.A.R.T. status of the drive in Disk Utilty by highlighting the Drive & looking at the bottom of the window.
https://discussions.apple.com/servlet/JiveServlet/showImage/2-18909570-134065/SM ARTstatus.gif
Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?
Open Console in Utilities & see if there are any clues or repeating messages when this happens.
How much RAM & free space do you have also, click on the Memory & Disk Usage Tabs.
In the Memory tab, are there a lot of Pageouts?

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