It's true, I'm sure lots of times people simply click a vote for the title, the image, or the author's name, without even opening the post. If it's a video there is the extra step of starting it (which doesn't mean they'll finish watching it). Then there are all the auto votes. In the end it makes you wonder how many people actually received the information...
The exception is comments like yours here: They leave no trace of a doubt that the commenter has read, and probably even liked the content. So a big thank you for that!