Yes, that is actually how I found the props to make this library. However, some people find libraries like these easier to navigate than the model browser (myself included). For example, if I was searching for the small buildings at koth_king's mid, I wouldn't look for "bookstand001.mdl".
This library's 107KB loads a bit faster than koth_king's 15,113KB. Also, just because one person doesn't find this library useful doesn't mean others won't either.
I've always thought it weird people use prop libraries. You should all want to map so bad you have every map memorised from staring at reference pictures and playing TF2 all day.
All kidding aside, you should put up some pics to demonstrate what's in the file.
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A Boojum Snark: Don't listen to grazr he is probably drunk