Seeing as I already follow a bunch of webcomics outside of tapas, such as Parallax, Devil's Candy and Sleepless Domain, adding the rest of my tapas library to my bookmark list wouldn't be a problem. There's the additional bonus of creator's own sites often being themed to match the comic, which gives it more of an ~ambiance~when reading, hehe. It just looks nice!
What makes it SO much more comfortable though is if they have RSS feeds! That means I can just open the "webcomics" bookmark folder that's sitting right there under the address bar in my browser and roll through the list and see which ones have updated. It's fast, and it's simple. (Actually it's faster than opening tapas.)
Those that I follow that don't have the RSS feed have twitter accounts instead, so I don't miss out on any updates there either.
The good thing about tapas though is that I've found so many webcomics here, that I can read it on mobile, and the nice community. That being said, most comics I found through the forums and not through the actual site.
TL;DR: Basically, I'm already on tapas, twitter, and have bookmarked RSS feeds. Shifting around who's where won't affect my reading habits at all.
It's like adding a bookmark to your web browser. You basically click on the "RSS feed" button on the website, it opens a new window where you pretty much just hit OK (you can choose where you want the bookmark/feed to be, in which folder). Then you can see if there have been any updates just by opening that RSS folder, without even visiting the website!