Most of the time I do read other peoples resumes, but if their partner searching thread is extremely detailed in what they want and what they give, I tend to forget the roleplay resume since the most important info already is in the partner search thread.
I am horrible at keeping my own up to date, but usually there isn't much to update once I get to it either way.
I think the resume is a great way of getting an overview of if you might be compatible with your partner or not. It is especially important for one x one players to get compatible partners as they will only have that one person to play off of, so if styles mismatches too much it can be an inspiration drainer for one or both the players (of course this isn't the case for EVERYONE, but if you are a person who needs a certain type of player, the resume is your best friend), while in a group if one or two people don't match the styles you want to play against, there are usually other people who do match what gives you inspiration.
Some are more picky with finding a partner that is almost exactly like them, while others don't care at all if their writing matches their partner's. Usually there is something in between where one wants their partner to be able to reach a certain level in certain areas while other things doesn't matter much. (For example, someone might want to have at least three posts a week, doesn't care about post length and only wants to rp in PM. Or they want someone who plays a male character, wants somewhere between 2 and 4 paragraphs and doesn't mind waiting a couple of weeks for replies even though they themselves are a very frequent poster.) If a person has restriction/requirements, the resume tends to be a great way of getting a fast overview to see if that person meets their expectations of a partner.