I have just spent 3 days at Yosemite, following on from an anti-clockwise tour that included, amongst others, Grand Canyon, Zion, Bryce Canyon, Grand Teton and Yellowstone national parks.
To be honest, I found Yosemite difficult for exactly the reasons that have been mentioned above. The other parks were easy in the sense that they had well defined features that, in themselves, offered great photographic opportunities. There is a lot of bland greyness about Yosemite.
If you think about all the "great" Yosemite photographs you have seen (and there are many), they almost always rely upon dramatic sky or weather to give mood to the image. Otherwise it is just a sequence of lumps of grey rock and a few mediocre waterfalls.
I think that to "do" Yosemite well, you would need to live within a few hours' drive of the park so that you could get there whenever the weather forecast promised something extraordinary.
In contrast, if you take Grand Teton NP as an example, you can get out of your bed at 4:30am at this time of year and get early morning shots of the Mormon Row barns, several Schwabachers Landing locations and Oxbow Bend all before breakfast.