My issue with the translucent highlighting is that if I'm trying to visualize a road trip within a region or my completion of the region itself from a wide enough perspective, it really doesn't matter whether the highlighting is on "travelled" or not, because I can barely tell the highlighted sections from the unhighlighted sections... I'm sure the translucent overlay when not highlighted is extremely useful from a highway maintenance perspective, but for a casual mapper such as myself who is interested in making visualizations of my personal travels, it's incredibly distracting to have even the unhighlighted (still translucent) lines on the map. I don't know if it's possible to add opacity settings to the unhighlighted sections, or how much computing power it takes, but I'd certainly be willing to optionally wait longer for a load if it gets me a better map view.