I like it in principle, but it can also be really annoying and fussy. A lot of the time with Rust (perhaps because I'm no good, but still) I find myself fiddling around with some inane difference between two types I don't really care about (for instance, whether a function pointer is boxed or not). It gets so distracting that I often do the bulk of the work with the linter switched off, just so I can actually think about what I'm doing without having to go down a rabbit hole just so an option is turned into a result in some bit of the code I'm probably going to delete anyway.

I think a combination of the explicitness about performance implications, the focus on safety, and the whole lifetime thing leads to Rust being, if not specifically complicated to write, at least extremely fiddly. Which is great if you're in some kind of hot spot where you need all that control and safety. But when you're just trying to add two strings together to make some random error message, it's actually really annoying having the language purposefully complicate things just so you realize there's going to be an allocation. It leads to a really weird distribution of effort, where I spend about half the time on important stuff, and the other half on things that are so trivial and irrelevant to both performance and user experience that I'd be totally happy if they were just all dumped on the heap and cast through void pointers.