I like post formats. I don't care whether my readers know or care about what kind of post they are looking at. But I do care and I want to write my posts so that I can sort them with formats too. Like If I wanted to see all the images I posted in travel categories or all the status I posted in ramblings. I also like post formats because they kind of remind me that it is not necessary for me to write lengthy articles. They also make WordPress a little more personal and blog-like.