Absolutely, upvoting is a way to recognise and appreciate the effort put into creating meaningful content.
It's true that we can't read and upvote every post due to lack of time, but the important thing is to do our best to support the posts and comments that impress us.

Every upvote counts even low votes that add up to all other votes, so it contributes like the others to support a post.

The only thing is that we have to manage the distribution of our daily votes well so as not to lower our voting power too much.
But just keep an eye on SteemWorld and see how many votes we can give.😉