This extension works pretty well, creates an html page list of all extension and even sorts them into enabled and disabled:Export links of all extensions. You then just have to click through them to install, but I didn't find a way to bulk import using the copy into directory method anyway, I think you still had to click multiple times to load unpacked. There should really be a Chrome version of this: OPIE Firefox Extension which would pack up and export/import all manor of profile parts.