Dialog box delays with iDisk

I'm sure we've all experienced that annoying delay that sometimes occurs when we've got a CD or DVD sitting in our Mac's media drive. Call up an Open or Save dialog box and you have to wait while the disc spins up. Keith at MacIT.org noticed a similar delay that seems to have been caused by the local copy of his iDisk that he kept mounted on his desktop. He writes:

"I turned iDisk Syncing Off in the .Mac System Preferences, which turns the local copy of your iDisk into a disk image file and un-mounts the volume, and the Open - Save dialog delays have disappeared."

I've tried turning off my local iDisk as well, to see if I get similar results over the next week or so (as Keith notes, Transmit is much quicker with iDisk file management anyway). Has anyone else experienced this?