You obviously dong drive around the M25 very often I can assure you it's NOT a comfortable drive, EVERY day and I mean EVERY day there is major congestion between the M25/M4 junction upto the M25/M1 junction regardless of the day but obviously even more so during peak times.
The M1 to M4 is a stones throw you say well I would like to see you throw a stone between those two junctions it's not that close especially when your travelling about 20 to 30 miles an hour in congested traffic.
A pathetic statement on your behalf and I suggest you drive that route again which you found so comfortable as it must have been a long time since you last did.