This may be a fairly obvious hint, but you can consolidate every Smart Search on your computer using a single Smart Search folder (this beats putting every Smart Search folder in your side bar, if you ask me). When you make your new consolidating Smart Search, use the Filename field from "Other," set it to Contains, and then type .savedSearch in the field. This will put all Saved Searches under that one single Search.

As seen in this screenshot, you can add a Raw Query so that this new all Saved Searches folder doesn't show up -- just include its name in the Raw Query, as shown.

I guess you could also just put an alias to the ~/User/Library/Saved Searches folder in your Sidebar, but that's less geeky.