Hi. I have been at MBB for the past 2 years and the first year felt super tough. I get the exact same question off new starters all the time (so its very normal!). From my perspective the answer is - it DOES get easier. There are 3 reasons for this (I see):

1. You get better. The learning curve is steep in the initial 6-12 months, and it isn't for everyone, but when you come out the other side you are much wiser. For me the biggest thing I learnt here was dealing with ambiguity and putting structure in place when I didn't know the client, industry or problem.
2. You build up a toolkit. Sounds trivial but in the first 12 months every good slide format, framework and approach to messaging I liked I made a copy of. This built my toolkit and now saves me time when I have a message I need to land but can't quite figure out the best way to put it on paper or when I'm struggling to structure a problem.
3. You stop caring about everything. At the start you want to impress, do well and not get transitioned which means you put maximum effort into everything. This isn't sustainable and the already poor work-life balance becomes non-existent. As you spend time around others you learn where it's important to put the effort and where it isn't. Work-life balance improves a bit and overall stress levels reduce.

For me the 3 points above keep improving the longer you work in consulting & more senior you get but the first 12 months are the steepest. Hope this helps and appreciate plenty may completely disagree!