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I wouldn't recommend blindly converting every book without seeing if it first needs any tweaks to get it to how you want it to look on your reader. You could be really messing up some nicely formatted books.
But if that's the way you insist on going, why not just select all your books in the Calibre library by hitting Ctrl-A, use dickloraine's modified plugin mentioned above with Remove line-height settings checked, click OK and then go to sleep. Not time-consuming at all as long as you don't intend to sit and stare at the screen while Calibre is working on the changes.
Or in the Look and Feel tab of your preferences in Calibre, find out which line-height spacing you prefer and leave it set to that, then you no longer have to be bothered making any adjustment on the reader. For myself, I find 120% with the font I prefer works well. And again, you can set Calibre to convert all your books at once while you're away from the PC.
Calibre is a great tool that makes library management and converting your books as easy as possible. It's not however meant to teach you everything there is to know about the inner workings of how epubs are put together, how publishers can create either a very nicely formatted book or a real mess of a book, and how each brand of ereader hardware and reading apps handle the books differently from each publisher. That's far beyond the scope of what Calibre or any program can do.
Being angry about it is just a waste of time better spent learning more.
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