there have always been religiously dressed portion of student body, you may be just noticing them more. In some religious the outward signs are more than others - for example the jewish orthodox students or even some christian denominations. Sikh students ofcourse have had their turban and kirpan. I have noticed pretty much the same number of muslim outfits as ever before - guess it is a question of where & where all you roll. Hindu/Bhuddist/Jain students have by far the leaast outward symbols.
Yes, as you say, it does feel inconvenient and clumsy to watch them maneuver around but I find that subtley different between UK and France for example. The clumsiness and discomfirt seems less and they seem more ‘fluent’ in France than in UK. But again as you say, if they are comfortable with it, who are you and I to question!
As to drinking, anything to any extreme is a problem - whether it is binge drinking or outright banning of alcohol.