KDE is heavier than I really wish it was, especially since I'm on a refurbished, aging laptop, myself. But I'm so used to the convenience of KDE's accessories that the menu styles and setup of Environments like LXDE make me feel very awkward.
Like not having Dolphin.
I am constantly double checking between my Terminal (Yakuake) and Dolphin. Or I'll browse around in Dolphin, find the path I need for something, then copypaste it to the Terminal before I start inputting commands.
That's just one example.
Also, there is Yakuake. F12 (or key of choice) = drop down terminal. So very convenient.
But I understand where you are coming from.