Hi Angelos,
Thanks for your feedback. We are glad you enjoy many of the updates.
You are correct that there is currently no shortcut option to toggle between the single and 4-panel views. We do already have a feature request in for this option to be added. There are, however, shortcuts which can be used to quickly jump between the different views. You can find the settings for these by going to Edit > Keyboard Shortcuts, and then expanding the Common Viewport Commands section. By default, the Perspective view is Alt-G, and Front, Side, and Top are Alt-H, Alt-K, and Alt-J respectively. You can edit these to your preferences.
As for moving the camera using only WASD, this setting can still be enabled. Go to Edit > Editor Settings > Preferences. Under Viewport Controls, select the dropdown for Flight Camera Control Type and set it to Use WASD for camera controls.
We have also noticed that Find in Content Browser does not always go directly to the asset. We are looking into the cause of this.
Also, I noticed that you made this post Private, although it contains no sensitive information. Would you object to it being made Public so that others can view it too?
Cheers!