Sorry, can't think of any worthless tools.

My most annoying tool is the Park Tool Campagnolo cassette tool. It needs a 1 inch wrench! So I got a Sears 1 inch to 1/2 socket. Then it slipped off the first time, half mangling the teeth. So I had to remove the quick release, apply the cassette tool, then put the quick release back on over the tool to hold it down. Grrr.



I got a Crombie cassette tool, and it's so easy. Leave the quick release on the wheel! A moderate pull on the Crombie is just about the right torque for the cassette. I'll switch cassettes just for one ride, it's so fast.



5 sets of Hex wrenches
I like my Park Y wrench, and use it often when there's room for it.
But I also have:
a set of loose L wrenches, for tight spaces.
a folding set of wrenches--but why can't they make these so the wrench arms won't flop all over?
And a set of hex bits for my small torque wrench

and
screwdriver handled wrenches in 3,4,5 mm sizes. These are great for assembly or disassembly, it's fast to spin the bolt in this way, and easier to get the bolts started correctly. But I usually need another wrench to do the final tightening.
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