brothalee94, i fully understand your concerns (your inspiration, creativity, work and time versus grab what you like from workshop and utilize), but same time - like RedHair already stated - that's the sense of workshop items and if you don't like the re-use of objects or ideas, then better don't share them.
an idea/solution would be, if Planet Coaster adds a credit-line to a blueprint, a watermark signature that the original blueprint was designed by [SteamUserName]. i guess that would help big time to be far more pleased when other people take advantage of own creations without asking / telling / claiming that they've done exactly that.
btw, did the creators of the real King Island Park sent a copyright infridgement note to you for unauthorized reproduction of their corporate design, their park- and ride names?