I used thigh pressure a lot more when I rode English than when riding Western. The English riding position lends itself to that. I used my feet with Western more than my legs. Never felt I could apply thigh pressure as well in a Western saddle (and always hated the horn....even when it was usefull). But for comfort the Western style seat is hard to beat.
As for the reins. As RunJumpRide already pointed out, neck reining is much more subtle. With a well trained horse it can almost go unnoticed. Holding the reins in you left hand, mid pommel, if you move your hand from the wrist just an inch to the right you end up with a rein laying completely on the left side of the neck and lose contact on the right. That's barely discernible, but the horse's sensitive skin notice the difference in contact location and responds.
As smrobs pointed out. If you're working from horseback or spending all day in the saddle reining is certainly the best option and if you do it long enough you'll soon enough feel it 's the only option :))
Many years ago I stopped using bridles for long distance rides and just rode with a halter. It was a pain having to take off the bridle so the horses could comfortable graze when we took a break. Neck reining my horses didn't require me to use a bit and bitless bridles were unknown to me (if they were even available) back then. Neck reining was so convenient that I could be walking back from from the river, catch a horse in the pasture, loop an empty stringer or some bailing twin (if I had some) under the neck and ride the 1/2 mile home bareback with no halter, no leg pressue except what's needed to stay on :)), just the neck reining pressure.
I never regretting starting out English. I learned alot about sitting, balance, leg control and resisted going to Western after moving to the US. However, when you work cattle or spend all day riding for any purpose (except perhaps fox hunting :)) ) you're hard pressed to beat the comfort of a Western style seat or the control ease of reining (and my thighs were never tired after riding 30+ miles a day :)), whereas I wouldn't have been able to walk if I'd stayed with English for working cattle and riding long distances)