It should help me visually find tabs, but truth of the matter is that it doesn't. Horizontal tabs become useless after 10 tabs opened, indeed, but vertical tabs become useless after 30 tabs opened.
Opened tabs also consume a lot of memory. It's why I now use Auto Tab Discard, which works, but then gets in the way because by Ctrl-Tab-ing you end up hitting inactive tabs that you did not want, which are then reloading and it's annoying.
What does help me in finding tabs is tab search via the address bar. In Firefox it works great, you can also prefix your query with a `%` to limit your search only to opened tabs.
Chrome also provides a way to search open tabs. It's not as good as Firefox's and you have to enable it yourself, but it's fine [2].
[1] https://add0n.com/tab-discard.html
[2] chrome://flags/#omnibox-tab-switch-suggestions