If you can see, I didn't put the colors of the words, I use dark themes because I want to work without getting tired my eyes. Despite of all, I think it must be only changing a few lines of code inside the IDE. I think there are more people like me that want's to improve the Lazarus project, but I don't know where to change it to recompile it and enjoy the benefits.
So instead of criticizing... let's be more proactive!!!
well just for this I uninstalled 1.6.4 cleaned up unused controls installed 1.8.2 and lo and behold, it does not show any lines by default. Now, until I find some more time to search the options and included addins to enable the "lines", I suggest you search your installation for other settings and what they do, for example in the options dialog in the editor\display\colors leaf there is a group of 10 colors, named, outline colors. As for the "do not color the words" comment, is for the developers of the addin not you.