HDRI Wizard is the latest Addition to my Blender Addon Wizard Series. As a Fan of EasyHDRI, I took it's ideas and rewrote it from ground up, packing the UI into the Header area of the 3D View. From there, you can easily switch between HDRI's and adjust the Color and Light Settings.
Additionally to the HDRI functionality, the Studio Settings in Material Preview Mode are available in the same Area. Another minmal, but useful feature is an easy to access Toggle between Eevee and Cycles, which I use for Years now and always missed in Blender.
Take a look at my Website, where you can find a short showcase Video plus an overview about the functionality.