Yes. I first went to Chiang Mai in 1998. A lot has changed, particularly on the outskirts.
But fortunately, much of the old city remains as it was decades or even centuries ago. I occasionally walk from my home, across the old city, to Tae Phae Gate, and whichever street I take, I almost always come across another beautiful old temple.
So even though it's changed, it retains its charm.