I've been in the design industry going back to Photoshop 5. This well before there was such a thing as Creative Suite, before Adobe bought Macromedia and before Quark made such a mess of their desktop publishing application that everyone switched to InDesign.
Adobe has a complete monopoly on the design industry. In the US I've never come across a designer that doesn't use Adobe products. Using anything else is a surefire way to be ostracized and struggle to find a job. Overseas, where Adobe software tends to be more expensive, and design culture isn't as entrenched in a particular mindset as it is in the US, you sometimes saw other software used. But it was rare and most who couldn't afford Creative Suite just pirated it. Often, the best case was that they'd get a single license and then crack it for use on multiple machines.
In the US, the design industry has screwed itself. They've collectively deemed that Adobe software is The One Way (tm) to do design. You're not a real designer if you work any other way. Making things worse is that like a pack of suckers, they'd rush out to upgrade the instant the next version was released. Adobe's model of preventing backwards compatibility meant that if you resisted upgrading within a few months you'd find yourself receiving design files you can't open. Flash, for example, went from plenty of options when saving in the Macromedia days to allowing you to save back a single version. Whether or not your files feature new functionality is irrelevant.
So the end result is that you're dragged along on the upgrade cycle whether you like it or not. But the most frustrating bit here is that the vast majority of designers never touch what new functionality Adobe has introduced. But then most of that functionality has very limited utility for most people. And while there have been some valuable updates through the years there have been core issues that have yet to be addressed. One is how the UI amongst the various apps is inconsistent despite Creative Suite now having been around for at least 10 years. One of the more ridiculous issues is how most apps in the package, including Acrobat, lack support for retina display.
Knock Microsoft and Office all you want, but they've always been good about updates, their UI is consistent across all apps, and they supported retina early on. On top of that, you can still work effectively with an old version of Office. And most important of all, they don't have a monopoly on any industry.