I have Rhymezone bookmarked, although I only use it when I feel like there's a word I'm forgetting that would work PERFECTLY for what I have. I didn't use a rhyming dictionary at all for "Welcome to the World", which some of my rhymes were called "predictable", but not "forced", so obviously the words worked, but it was just not very surprising or different.
I did use it once when working with lovesong, though. The verses all had the same rhymes, so I was really pressed for words to use. If the second verse felt forced, that'd be why.
Although for me, it gets to the point where if I think of a line, I fairly quickly think of something that fits the meter and rhymes at the end. It's natural for me at this point.
