After 2 years of virtually zero American/Japanese/Chinese tourists, when EU opened to non-EU visitors last August, they released the pent-up demand. We were there then, and it was heavenly with no American backpackers, no busloads of matching-capped Asians crowding and selfie-ing Europe. This is NOT the Summer to 'see' Europe! It will quiet down in the off season, or book now for shoulder season travel.
Jim