My first lesson in landscape design school was to preserve sense of place in your design, usually by keeping as much of the trees, topo, etc. Enhance it via circulation, emphasis, etc., but don't bulldoze it, or it WILL look like any other place.
Also learned that we are creatures of habit, and will probably design the same approximate product over and over, unless we consciously decide not to. Back when we might be designing a few courses at a time, I had the opportunity to compare two plans, and there were distinct similarities, namely target bunkers and "anything but a circle" greens, to name two.
Oddly, the path to different design for me was to follow the first paragraph, but the second is to have a hip pocket list of design ideas. Whether my ideas, general ideas from courses I have played, or wacky things I always wanted to try, I have a journal of them. I even have a record of when I used them, such as "Tangleridge '94, 6th green" or whatever.
As architects, we all have to balance using the site and golf design ideas. And, in some ways, looking at a green site with a few ideas in mind yields more concrete thought that looking at a green site with a blank mind/slate. I don't feel I have any problem forcing design ideas into a site, but then, I have never had an unlimited earthmoving budget, either. It is really only the most expensive projects where the temptation to force fit the same holes becomes significant.
Raynor proved very adept at putting the exact same holes, well adapted to their topography. IMHO having far more than 18 hole concepts (I estimate I have at least double that for tees, fw LZ and greens, maybe more) and the designers state of mind to keep testing different ideas until one fits is what design is all about. (I have thought about creativity, and believe continuous testing, replacement of this for that, etc. in quick succession is really the heart of creativity, vs. straight line thinking of a scientist or accountant.)
Back to the OP, yes design is somewhat homogenous. Construction materials, contractors working among different architects, issues of the day (environmental, residential, slow play, etc.) all begin to suggest similar solutions, even to different architects.