Personally, I would totally forget the whole question of expressing. The only reason to express is if you're very attached to the idea of your baby having only breastmilk, and you know you can't feed them yourself for whatever reason. If you're open to formula, then just use formula for any occasions where you want to be away from the baby. You'll probably find you need to express for your own comfort if you do miss more than one feed in a row, but you don't need to keep the milk if you don't want to.
With expressing, you've got to clean the pump, arrange a bottle or sachet to express into, then express, which can take time and uses one or both hands. Store the milk, keep track of how long it's been stored, clean and potentially sterilise the pump and bottles after collection, then warm up the milk, feed the baby, which takes two hands, wash and sterilise the bottle again, ready for next time.
Likewise with FF, you've got to get the formula powder in regularly. Make it up correctly to guidelines and calculate this correctly. Keep track of kettle water (etc), wash and sterilise the bottles. If you're going out you've got to plan in advance how many feeds the trip is likely to cover, make sure you've got enough milk to cover it and decide how you're going to make it up in order to best cover safety advice. Feed the baby, which takes two hands. Clean and sterilise bottles again. Keep track of overall formula level in order to know when to restock.
With BF you literally just have to feed the baby. You can do this with no preparation and no equipment. If you do need items like nipple shields or a feeding cushion, this normally only lasts for the first few weeks and then are no longer needed. Yes, you might need to do it more often, but this does settle down. You can even BF in your sleep if you're careful about arranging the bed - and when you're awake, it takes one hand, if that - you can use the other hand to read, mumsnet, control TV, etc.
It is totally different if you have other people to take on the load but when you're doing everything yourself, it really makes sense to minimise your workload.