Unfortunately, Adobe's policy has you over a barrel. Once they release a new version of Photoshop they cease to add new camera support to older versions.
I'm sure they figure "hey, you ponied up to buy a whole new camera, can't you spare $199?" ($199 is the actual cost to upgrade to Photoshop CS5 from Photoshop CS4, not $690). And they do of course have the free DNG converter you mentioned which gives you access to your files via a two step process.
This is just their way of piggybacking on the rapidly changing digital camera market and I think it's quite shrewd, if a bit irritating to new camera owners.
You can use the free DNG Converter to process 60D images. It may add an extra step to your workflow, but it costs nothing.
It looks like Adobe is pushing us to use DNG instead of the camera mfrs proprietary RAW.
Looking from a different perspective the statement above could be reworded as: "It looks like Canon is pushing us to use the camera mfrs proprietary RAW instead of Adobe's open DNG.
Converting CR2 images to DNG will allow you to continue using older versions of Photoshop/Camera Raw.