Very good point. I hadn't considered the lack of values case - what struck me immediately (the first time I was about to write such code, even) about at that snippet was the opposite case: if foo has several values you get extraneous key/value pairs - oops. So I have to agree that it's easy to create confusing semantics with wantarray.
At this point I am confident about my choice for this particular case, and reassured about the fact I hadn't overlooked any caveats myself. Thanks and ++ to everyone for their arguments and for pointing out some implications that escaped me.
Makeshifts last the longest.
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