I think another thing I hate about prayer is that it minimizes the good that is done by people. You pray for health but go to the doctor. You pray for food but you go to work. You pray for help but it is people who do the heavy-lifting. It seems to me that you or some other person is doing the work, but God is getting the credit. However, God doesn't seem to get the blame when prayer is not answered. If all you count is the "hits" and not the "misses" then, by definition, you have confirmation bias.
At best, prayer seems to be a placebo indistinguishable from meditating or day dreaming. At worst, it makes the person less likely to take responsibility and act on behalf of themselves and for others.