...yet somehow the entire modern "personal computing" industry grew from a few kids making systems in garages or moonlighting using college computers, and shook the plate glass palaces of the big incumbents to the core (IBM has changed beyond recognition, Digital Equipment corp is no more...) without any help from patents. Even the "look and feel" copyright suits died down somewhat when standard desktop GUIs took over from "Visicalc-style/Lotus-style/Wordstar-style" UIs.
It was only when those garages had, themselves, grown into plate glass palaces, and the new incumbents started worrying about the new kids-in-garages that they suddenly became big fans of the patent system.
Also, look at what must be the biggest, most successful interoperability project of them all: the Internet. All done with completely open standards (the RFCs) and no patents in sight - until it was up, running and successful, then everybody is suddenly taking out "doing something obvious on the Internet" patents.
Nope - apart from the occasional David & Goliath aberration, what patents mainly do is allow the big successes to pull the ladder up after themselves.