Why to people feel the need to use the phrases "In my opinion," "In my honest opinion," or their lettered forms? If you're spouting your beliefs and clearly not attributing what you're about to say to someone else, why is there a need to use the phrase? Just state your idea!
Using the phrases add fluff. Why the fluff? Do you need the fluff to make your ideas sound better or more important?
This isn't a big deal and it really doesn't bother me. Just one of those things that popped in my head randomly.