I do think my posts are sometimes annoyingly long. If I go back through the thread later and get annoyed at the length of one of my posts, then surely other people get annoyed as well. It's not that big of a deal to toss long ones in spoilers, and I suppose if people don't click them, that's more their problem than mine. At the worst, it will lead to more reposts from people not seeing spoilered pics. Not the end of the world, as long as people don't waste two pages griping about reposts.
It would be cool though, if we should put long posts in spoilers, if there could be a spoiler clicky at the bottom of the post as well as the top? That way you could just click it at the end and be taken straight back to the top to + instead of having to scroll back up to close the spoiler and + the post. (Why yes, yes I did just say I'm too lazy to scroll up. D: that's awful of me lol)
The main problem for me will be just remembering to do put spoiler tags in posts. /blush