I was recently very glad to learn that I'm not the only one who keeps many tabs open in Safari at once. And I got reprimanded for it. But it's hard to teach an old dog like me new tricks, especially when an extension like Exposer provides a great overview of all open tabs.
Once installed, Exposer puts a Spaces-like icon in your Safari toolbar. When you've got multiple tabs open, just click it and a set of thumbnails appear, each representing one of those pages. Mouse over any one to highlight it, and click it to jump right over. It can be a bit slow to load those thumbnails, depending on how many tabs you have open, but it's still quicker than scanning cryptic (or crowded) tab titles. Try it out!