I agree with most of the above points.
One way systems were introduced in the early days by the supermarkets, so have become accepted as 'the norm' by a public who are often quite nervous to be out. Remember that they have been told by the Government that if they leave their homes they will die, every night, every TV advert, for three solid months. Now they are having to be bribed to go to the restaurant because the TV campaigns worked so well. The one-way systems are often now ignored in the supermarkets, so presumably as confidence builds will be too in the zoos. Ours is working well, but we have added a second entry route for this coming weekend, and I hope we can remove it altogether (apart from areas like the Outback Aviary, which were designed to be one way from the outset), as soon as our visitors will accept this.
As Shavington says, I would expect the sanitizers will be permanent.
Not particularly zoo-related but I would really like to know when the 'lockdown' officially ends, has it happened already and if not when? Will it be announced officially? Radio stations etc that constantly referred to 'while we are in Lockdown' a few weeks ago seem to be doing so far less now. Like all the other things- the one way systems in supermarkets etc, will it just quietly disappear without trace or formal announcement? I watched people filling up at a petrol station today- a few weeks ago they were all wearing the gloves-not anymore...