I was in a similar position when I started using Huginn, I've managed to avoid Ruby for the most part (although dabbled in it for a few other things recently) and it's been pretty plain sailing. The only thing is you're limiting yourself to the pre-bundled "agents". For me that's been fine as I mostly do various bits of web scraping, api calls, etc, if you wanted to interact with more complex systems that don't run over HTTP you might find yourself wanting to write a custom agent.

I don't know Huginn much in detail, but if you do know any OOP language since before, just the basics around Objects, then Ruby will be fairly simple to pick up as well. Like most OOP languages, it has just minor differences in syntax in comparison to other OOP languages.