I've had very similar experiences with pianos. I'm by no means a master. I don't even consider myself proficient, but the opportunities that I have had to play a really excellent piano made things totally different. From the weight of the keys and their responsiveness to my touch to the acoustic quality and shape of the box surrounding the harp, everything sounded and felt different. I've only been "lost" playing piano twice in my life. Once was on a high end traditional full grand (can't remember the make). The other time was, to my surprise, on an simple Yamaha full keyboard (a high-end electric one with only 2 "voices"). It felt and sounded as good as the grand to me. I was shocked that an electronic device could really produce that sound and have such a velvety feel. It was a dream to play.
If instruments with that level of quality were accessible to everyone I believe that the amount of truly inspiring musical compositions would begin to soar. My piano play began to wane after those experiences simply because everything else left me flat. When you truly enjoy the experience of playing a quality instrument and the instrument itself is not fighting against you in the production of a really beautiful sound your creativity level goes way up.
With the studies out that have definitively proven the link between playing music (including singing) and the increase in abilities in language, math, and science aptitude I begin to wonder if more common access to high quality instruments would help to improve the math, science, and language problems we now have in the education system. I would certainly help reduce the amount of pop-noise that pervades our society today.