If you work with an AssetZoo (a level where all Props are organized, placed) the Actor Palette Plugin is a must

It allows you to have up to 4 windows that have another level loaded inside them allowing you to drag and drop assets into your main one!

The Asset come over with no scaling/rotation

Some fun little experimental Plugins (that you'll need to enable)

The first is a Search Plugin that can find information from all over the place, Text Renders in Levels, Comments in Blueprints, Gameplay Tags, its excellent!

Remember to index at the bottom right when you open it

I am an absolute power user of this trick and I always will be, pretty much everything you can do in Blueprints is going to end up being text.

This has many advantages when it comes to Data Entry for things like Maps, in that they can be manipulated in text editors and then just pasted back in!
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Thumbnails for Blueprints can be captured manually, this can be very helpful if the default Thumbnail isn't displaying quite what you need, just position your viewport with what you'd like the Thumbnail to be, right click the Blueprint, go to Asset Actions > Capture Thumbnail

Events in Blueprints can be made into Buttons you can click in the Details panel, this is super helpful for getting specific parts of your Blueprint logic set up quickly

There is a setting called "Game Gets Mouse Control" which will mean you don't need to click in the Viewport to start controlling when you start playing, you can press F12 to set your mouse control back to the Editor when needed

By default Q is bound to Straighten Connections, this goes a long way to making Blueprints readable and organized, you can change the keybinding to something else if that is more preferable

She won't sleep unless we have a cuddle but then snores like an old man