I really haven’t found many outstanding enhancements with the new features in OS X 10.11 El Capitan. One of the features that I do use regularely is “Tap to Mute” in Safari.
I subscribe to nearly 100 RSS feeds using the FOSS program Vienna to keep abreast of what the latest news is on a number of topics. I quickly scan through the titles of the 500 or so articles I get each day, double clicking on those that I want to see more of. That opens the respective article in Safari. I can then delete all of the articles and close Vienna. Then I start going through all of the tabs in Safari I have opened. This sounds a little overwhelming, but it usually takes less than an hour for me to complete my review.
One of the things I have found very irritating until El Capitan is the auto-play videos that some sites have. As I am skimming quickly though the article titles in Vienna, opening those that I want to read, I can easily have a few dozen tabs open in Safari (Thanks to the memory upgrade I made earlier in the year, this no longer bogs down my system). Suddenly my concentration would be lost when the audio from some video would start to play. Until El Capitan, there was no indication as to where the video was playing. I would have to open each of the recently opened tabs and try to find if a video was playing somewhere on the page.
Fortunately, with El Capitan, that is simplified. Any Safari tab that is producing audio output is identified with a little speaker icon on the right side of the tab. Without opening the tab, finding the running video, and then pausing it, the annoying sound can be muted by simply clicking on the speaker icon in the tab (changing it to a muted speaker icon). If you want to hear the sound from that tab at a later time, clicking on the speaker icon again will toggle mute to off.
See my other Mac OS X articles