CowgirlThing, I'd really like to help you understand where we're coming from. You see, there are things that we do with our horses that require a lot of finesse and training, and others, not so much. You yourself said that you do nothing more than plod around the pasture. That's fine! Nothing wrong with that. But you have to understand that this type of riding takes very little training or finesse. That's why it works fine for both of you to use a bitless bridle, web halter, rope halter, baling twine, or whatever else suits your fancy. As long as you can stop, turn, and keep control, your bitless bridle does the job.
However, there are others, like myself, that demand more of our horses. I have two major disciplines that I ride and compete in--eventing and reining. Both disciplines require a lot of skill and training, but I'll use reining as an example, as my reining mare is further along than my eventer. This horse requires a lot of finesse. There's more to a reining pattern than stop, turn, and speed up. A shift of my weight or a tickle with the spur will cue her to perform haunch/forehand turns, leg yields, spins, sliding stops, flying changes, counterbends, or changes in pace or gait. I rarely touch the reins. I could ride her in a bitless bridle, a spade, a halter, a hackamore, or completely bridleless. Why? Because her trainer spent years training and refining her to ride off the seat and legs.
However, this is a long process, and I sure as hell couldn't have ridden her bridleless or in a bitless bridle as a three-year-old and achieved the same level of finesse I could with a bit. The end result for a finished horse is a horse that is so finely tuned, he can ride without a bridle of any kind. Again, this is the result! The bit is the communication tool used to achieve that finesse.