Almost my entire house is furnished with IKEA stuff, bought between 10-15 years ago, and I've so far never had to throw stuff away because of wear or breakage. It's not like any of it will be family heirlooms handed down through generations like really high end furniture easily can, but I can easily see most of it lasting another 10-20 years or more.
My couch has survived 10 years of my son treating it as a trampoline, for example. Last couple of years I've had to constantly try to get him to stop jumping onto it from a running start through the living room...
I wouldn't really call IKEA furniture "disposable". I've had my glass IKEA desk since like 2006 or something. And even though my MARKUS chair recently broke down, I did have it for 5+ years and I got it exchanged for a working one under warranty as it has one for 10 years.
I think most of my stuff is from IKEA and that pretty much all of it beats stuff from other stores at the same price range. My TV stand is quite nice and robust and only cost me like 120 euro. I only found really shit, low-quality alternatives for the same price where the doors didn't have any soft closing and there were no ready-made holes for cable management.