I'm mainly a Java developer. I've just published a new article in Medium talking about how I was opening my mind lately to non-JVM stuff and how Rust came at that moment to my life.
That's my own personal experience, but I thought that this could be maybe a good starting point for a discussion about which were the things that attracted you most in your first developments with Rust, specially in opposition with your previous experiences with Java.
In my case, it's clear:
Performance and optimization: Specially the minimal size of the build, the ridiculous amount of memory used and also how fast everything works.