I pretty much only use loadouts to keep my EGO powers and perks organized. Especially since so many perks are tied to a specific ego power. So, now I have one load out for each of the 4 ego powers. I usually swap out my weapons on the fly, depending on the situation.
Since you're saying "L" I'm guessing you're on the PC.
Change the loadout/character sheet screen button to something easier to find. I have mine set to Tab.
I can switch loadouts mid-combat against everything except Dark Matter. For them I just cloak or duck behind cover.
Folk are talking about macros. I just click the number loadout I want.
If you have a Logitech keyboard and/or mouse, you can also make a macro and attach it to a key. I have it macroed to the "forward" thumb button on my G500 mouse, and my vehicle is hotkeyed to the "back" thumb button. I also changed the boost and handbrake to the left and right mouse buttons.
The macro I used was L^^^>L (L, up, up, up, right, L) That way, no matter where the "cursor" happens to be when you hit L, it goes all the way to the top.
I have a Logitech g310 gaming mouse, how would I go about making this macro for easier loadout switching?