Oh, I quite enjoy the YouTubers, most of the time, but I only tend to take inspiration from them in broad strokes. For example, if they use a certain animal, sometimes I'll think, "Oh, I haven't used that one yet, or in a while, so I'll use it too." I've still never made a dome, nor do I ever intend to.
YouTubers can be annoying at times as well though. Obviously they're good at what they do and all very creative, but it bugs me when they throw words around like "realistic" when making something that is exactly not realistic, or they profess some piece of knowledge that is entirely wrong, or they miss the point of something in the game. DeLady, for example, is doing a City Zoo at the moment, and the first build (the bonobo habitat) was great, but she separated the males and females, which for primates isn't something done very frequently (I can give that a pass, as it does happen in some zoos), but then the next build (the hyena and lions) while beautiful would be a management nightmare for a real zoo and is totally outside the realm of practicality and functionality. The hyena and lions are separated by a very thin, see-through barrier which would cause myriad problems for both species and be a major hindrance to their welfare.
I do also take some inspiration from real zoos, though not a lot, and again, only in broad strokes. My local zoo has a number of big paddocks around the periphery where they tend to keep "random" hoofstock. Along the back you've got zebras, Tibetan yak, giraffes, Asian water buffalo, American bison, white rhinos, and waterbuck, and then there's a huge cheetah enclosure, and then along the front there are addax and ostriches (there used to be scimitar-horned oryx here, but they're off-display now). That's something I quite like, as it's a good way to include some odds-and-ends animals in the game without having to squeeze them into a themed area. Animals like the bison, pronghorn, gemsbok, Bactrian camel, and reindeer, which don't really go anywhere specific due to their biomes or regions look quite nice in big open areas around the outside of the zoo.