After looking over the Yosemite change logs, as a non-iPhone user, it looks like a new font was all I had to look forward to. Every other update seems to concern sharing content between the desktop and iOS devices.
And now I'm finding out this new font- my only real reason for a 5GB update- is so unpopular that a hack to replace it is front page on HN.
There is a lot more to Yosemite than just a font change.
1. Calendar/Contacts are cleaned up further from what they used to be.
2. The little green button no longer leaves you wondering what it does, it simply full screens now on a single monitor
3. There seems to be better consistency across many different applications when it comes to look and feel, and all of the partial see-through/blurriness actually feels pretty nice and gives interfaces a little more depth.
4. Improved Safari with a new JIT JavaScript engine that makes the web definitely feel faster
5. iCloud Drive integration, which is nice if you have multiple Macs
6. Spotlight has been massively improved, and is close to replacing Quicksilver for me.
The Apple Watch SDK was released today, and people are falling in love with the new font that was released, this hack simply replaces Helvetica Neue with that new font, there is no requirement for you to do so, and I personally won't be replacing my existing font with the one linked here.
Issue 2 you mention is an issue for me. If I am in Safari or Xcode and click that green blob, I get a full screen window. Now, what if I want to use Calculator to calculate something related to the webpage or code I am viewing? I use cmd-space to open Spotlight and type "calculator" and press Enter. Now, I get a calculator but on an entirely different desktop because fullscreen apps and non-fullscreen apps cannot share the same desktop space. It's STUPID.
I know you can hold down alt or whatever to make it behave like it used to, but I wish they'd put an option in to make it behave like it used to as the DEFAULT.
And now I'm finding out this new font- my only real reason for a 5GB update- is so unpopular that a hack to replace it is front page on HN.