I can say that I don't do a good job of upvoting Ideas because I don't monitor the Communities closely.
What would help is if there was a way to subscribe to Ideas posts in a particular Place for a particular category. Even better is if you could say you just want to get an email for new ideas posted.
It looks to me like "Follow" will follow the entire Place, but the way CA organizes the products, that's too broad. For example, if I followed DevOps I'd be notified of products I don't use.
(Another reason I don't upvote is when don't understand the Idea. The Ideas are not always written to clearly explain what the current situation is, what the Idea is for changing how the product works, what the expected results are, and how that would be a benefit.)