Allow plenty of time. Book eurotunnel in future. IME delays are far worse on the ferries (not their fault). We travel on eurotunnel every 4-6 weeks.
We see far fewer asylum seekrs these days, here was a time where they where hanging around in groups by roadside and walking up the motorway 50k before Calais. Large camp right next to main road/port has been partially cleared. Any issues you may have will be on the return but really cars are not the target, its trucks / larger vans. Take care if you stop within 100k of Calais, ensure vehcile is locked and check upon your return, again not really an issue with normal cars.
Happy holidays