Gibson is one of those writers who are much better prose stylists than plotters.
I enjoy reading his prose immensely, but he's been stamping out books with the same template for ever: an expert is hired to do something. Turns out there's a man with unlimited cash flow funding everything, but was hiding his true intentions (usually in order to lay a trap), which are revealed, and then some McGuffin is saved or eliminated or whatever; meanwhile, the main character mostly didn't do anything, just a passive spectator to some plot unfolding around them. The one I will forgive most easily here is Count Zero, which I think is much better than its reputation (except for the Haitian voodoo deity stuff, which didn't land for me); while the template is the same, the ruse connects well with Neuromancer, and it's just a fun, action-filled book that is definitely not boring. (The ruse in The Peripheral, by comparison, was deeply unsatisfying. Agency was junk, most of the book describing preparations for a military attack while the main character sleeps. Even the prose was much worse and much sloppier than usual.)
What's interesting is that his early short stories are much more original, I think. Burning Chrome, New Rose Hotel, and Johnny Mnemonic, for example, show flashes of originality that maybe Gibson wasn't able to keep up when plotting out whole novels.
Yeah it does seem like he picked his story structure in 1984 and decided, “well, that’s done, now on to the interesting parts.”