When you want to quote something, just hit "quote"...if the bold tags bother you *that* much, just delete them.
When I see an unbolded quote, I assume somebody typed in the markup manually instead of hitting "quote". The message has still been put across, and it's no big deal.
Oh, I'll remove the bold tags if there's a huge overwhelming majority of posters who want them gone, but so far I see one person. Out of over three thousand.