I.e. only 2 downvotes?

I sometimes too want to express my appreciation for something with more than just an upvote, but find myself without anything insightful to say. The current solution is to get an "yes, it's ok to just upvote" counseling, but I sometimes wonder if there isn't something to improve there.

Upvotes signal everything from "it's a great idea!", through "oh, cool", to "headline looks interesting, I want to save that for later reading". On the other hand, since posting "it's great" doesn't seem like much of a contribution, even the best ideas (or Show HNs) end up having lots of criticism in comments here, despite that most HNers may actually really like it. A way to signal "it's a great idea" besides upvotes could correct the comment bias.