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@Courant
There are also a couple of other effects....
Having your bum further back engages the glutes more - this is excellent when your out riding for longer distances as the glutes are a very strong muscle group, and engaging thems means your quads don't get so caned.
Having your bum further back takes load off your arms - if you get sore shoulders, your saddle might need to go back.
Moving your bum around changes the weight distribution on the bike. Different frames put the bottom bracket in different positions relative to the front and rear axles (defined by front centre length and chainstay length, plus BB drop). If your bike is designed to be ridden with the weight back, and you fit an inline post, you will put more load on your front wheel. Which may be a good or bad thing!
Personally, I think more people could do with using more setback, but that's just another way of saying that a lot of people have poorly fitting bikes!