I am perfectly aware of the fact that it is just a special case, the summary was not needed. However I am also aware from experience that people tend to look at you strangely when you have different numbers of return values in different cases. And furthermore the request was explicitly not a case of modifying elements, it was a straight filtering operation. Given that here are both strategies side by side if you assume that $unwanted is the element you are trying to remove:

@filtered = map {$_ eq $unwanted ? () : $_} @original;
@filtered = grep {$_ ne $unwanted} @original;
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Most people find the second much more readable. If you don't see why, then I suggest grabbing some co-workers, showing and explaining both, and trying to explain to them why they should find map more readable...

Remember, generality often conflicts with readability. map is a far more general and complex function than grep. As such, when you see it you need to read very carefully, because a small detail can make a huge difference. But straight filtering is a very common need, and in that common case grep is simpler to write and easier to read.