Even the "shopping centres" will be dipping out this summer. Last week (mid-week) from arrival at Premier Parking to being dumped in T1 arrivals took 50 minutes. Add the queue for check-in, add the queue for security = 2.5 hours means no time to shop at all or even buy that lukewarm coffee & soggy Panini for £5.50.
The hassle factor & long long time needed to arrive for short flights, often much longer than the flights themselves, make the alternatives to MAN much more attractive.