I've seen a couple of ways to navigate.
How many different ways exist for power users in 2019 ?
There are a lot of ways!
1. Services Dropdown
First of all there is the menu system you get from clicking services
It lists most of the services for you to click on one.
Below you can see several of the Compute Menu Items - EC2, Lightsail, etc.
2. Input Search Field
Next you can type the service you are looking for in the text box, e.g.
3. Recent History
Next you can use the recent history of functions that shows on the left for recently used functions
4. Bookmarks
Finally (and my favorite) you can 'pin' commonly used areas to the top bar, similar to a browser bookmark bar. You can have icons, text or both, for example I have just Icons to squeeze more in. Click the thumbtack icon to change which ones you have:
Of course you can also have your classic browser bookmarks for the various areas too and you may prefer all your bookmarks in one place. Or are ok with them being in two places as well.