Rapidweaver is a well-known WYSIWYG editor/builder that's been around for quite some time. Then there are newer ones like
Sparkle and a web-based app called
Blocks. I can't really vouch for any of these things, though, because I have no need for them.
I know you've probably heard this a hundred times and don't want to hear it, but I promise you'd be doing yourself a favor by pushing yourself into being more comfortable doing things "by hand," especially if you're only going to need to rely on the basics to do something like tweak simple websites you've already made. HTML and CSS may be getting more powerful by the day, but all the fancy stuff that's possible to do now doesn't make the simple stuff more of a chore (in fact, it's quite the opposite). I started teaching myself HTML/CSS when I was, like, thirteen years old, and I promise you that if the lazy sack of flab that was pre-teen me could pick it up, so can you.
Learning this stuff is easier now than it has ever been. Not only are there
many intuitive and beautifully made IDEs/text-editors (both open source and commercial) to choose from, but there is a bounty of kick-ass websites available to reference and learn from. Editors like Panic's
Coda and MacRabbit's
Espresso are powerful, but easy to use, and provide features that are comparable to aspects of Dreamweaver (live previews and GUI-based live styling) without the handholding and unnecessarily restrictive (and bloated) code generation. Then there are sites like
W3Schools to start learning from the ground floor and more comprehensive (and, as a result, more technical) resources like
MDN (Mozilla Developer Network), which now has a
very nice guide for beginners that I'd personally recommend over W3Schools.
Basically, I'm saying that if you are technologically savvy enough to feel comfortable playing around in the magical world of beta operating systems (and since this thread is in the OS X 10.11 forum, I'm assuming you are), getting a handle on HTML and CSS shouldn't be too difficult. They're by far the most accessible aspect of web development and you've got nothing to lose other than a bit of your spare time.
Knowledge is power, friend!