Chrome: Black Menu gives you short cuts to all your favourite Google services in one place. In addition to quick access to primary services like your Gmail inbox or starred documents, it has a host of links to lesser-known corners of your Google account.
A little over a year ago, Google tried an experiment with its navigation bar, creating a rollover menu for all its services. It did not go well. This extension has a similar style, but is much more convenient.
From the menu, you can access your Dashboard and Google Settings page, or jump directly to your devices and content on the Play Store. It's not a complete control panel -- Keep, for example, is absent -- but it still shows a lot more than Google's defaults (which neglect features such as Voice). If you're looking for a way to consolidate, it's hard to get much more comprehensive than this.