I agree with some of your points. I just think you are underestimating its usefulness. If you lose alot from limping then you are not understanding the exploit. No im not limping monsters, and no im not limping against maniacs i dont agree with you there, im merely taking the advantage of limping marginal hands that can mature into the nuts from any position, because everyones limp range is wide and weak, and post flop people will often just donk around.
Is this strategy a large part of my game? No of course not, its just alot of players think you need to limp less because limping is generally bad, but if people are not raising preflop at the frequency they should then the solution is to limp more than you normally would because you will not get punished for seeing the flop, and post flop people are usually not playing correctly allowing you to see cards you normally shouldnt.