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I use QGIS and a spatialite database that I load my gpx tracks into after each ride. The database is up to 1.2GB now with my 111,000 km of Strava rides. If you set the line thickness very thin you can see ever individual pass. Close to home there gets to be a lot.
Wandrer.earth is a good strava based site to keep track if you are riding an area for the first time.