OS: OpenSuse Tumbleweed with KDE. Icon Theme: Reversal
I used the Latte Dock before but since it didn't play nice with Wayland and is basically unmaintained now, I simply transformed a KDE Panel into a Dock. I use a KWin Script called "Panel Auto Hide" to make the Dock disappear when window hits it.
I usually have all windows over 2 - 3 workplaces placed. You can see which windows are open in the dock with the bars to the right from the symbol icons and I use mostly alt + tab to circle between the 3 - 4 windows per workplace. And should I really need a view of all open windows, I can move the mouse to the top right corner and activate the overview ๐
Works for me.