I've done a lot of firewood blocks that way in order to get them light enough to roll to the splitter. After 4-5 of them it begins to become work. Around a dozen you're saying to yourself that you have enough split for that session.
I've also split a number of fence posts using what I call a walking-wedge method. But I've yet to split a log to go on the mill. I have a big one laying now that I'll follow the natural cracks to split. I may have to cut a recess for a bottle jack to get'er over the hump.