I hope by now you have subscribed to a bunch of topics using Google Scholar, including any citations to your own work. This will keep you informed on topics closest to you, even if you don’t read the papers through.
For teaching and future projects, it is a good idea to be more broad. One way of doing that is to subscribe to tables of contents of a few of your favorite journals. It takes only a few minutes to browse though those lists, occasionally clicking on the most interesting looking titles.
If you are responsible reviewer, you will see a lot of new work that way. If you are not reviewing as much as you would like, please let your friends on editorial boards know.
If you are writing a paper or a proposal, odds are you are reading intensely in a few areas.
In my Dropbox so I can get at it anywhere I have a file called Read This!. It is supposed to let me read articles effectively. If a paper is in that box, I have read the abstract. Sometimes I get to the rest of the paper, but mostly they languish there, gradually falling down the list.
But why do I say you don’t read enough if I struggle with it myself? Because it is a constant challenge. Because I don’t hear conversation on papers as often as I would like. Because students discussing their time use do not usually bring up reading papers.
It is all right to read some things more thoroughly than others. Even reading titles can give you an idea of what is out there. Keep reading through the abstract or even turn to the figures and you are likely to get most of what you need. So read thoroughly and carelessly. Don’t necessarily keep track of everything. The mind is a complex place where ideas can sort around and stick together in exciting ways. Maybe if reading were allowed to be haphazard and fun you would do more of it.