I saw this and tried it .... It is amazing! Found on slashdot.
Actually, this is much easier. Go to your Acrobat\Reader folder and take everything from the "plug_ins" folder and move it into "Optional" except the following: Search.api, Search5.api, IA32.api, EWH32.api, EScript.api. Printing and search will still work, and it will load 75% faster. This is on Reader 6.0.