I always thought public prayers were a waste of time. If my brother calls my father on the phone, and I stand there listening to them, but right before he hangs up I grab the phone and say "me too!", would my father really think I was part of that conversation? No? Well then why would God think that I am praying when I am just standing there listening to another guy pray?
Normally I would just say my own prayer in my head and completely ignore the public prayer. Or, just completely ignore the prayer without praying. Either way, I found it to be useless.
I hate prayer fluff too. "We know we're living in the last days..." "We know we sin and fall short many times..." "We know this old system of things will soon be over..." on and on. One time, a prayer was going on and on, a young boy in the audience yelled "AMEN!!" and started crying. I felt the same way, lol.