I set my own schedule, handle work that involves some of the most important things in my clients' lives, get to allocate my time and choose what to work on any given day based on my mood and inclinations, get to work with and against intelligent people, get to compete and win at something, take vacations when I want and for how long I want, and get to occasionally do interesting work.
A lot of why I don't mind being a lawyer can be described in terms of what you DON'T have to look forward to. If you're at the right place (e.g. the following probably doesn't apply to most biglaw jobs), you won't look forward to being micromanaged, having your internet use scrutinized, having set break times and times to come and go, being evaluated by an incompetent boss using stupid strict rubrics, and being poorly compensated. You won't be dealing with stupid people / customers / end-users. You won't be selling things or attending boring, awkward networking events (unless you want to). You won't be traveling to conventions, setting up product demos, or training people on-site for days or a week at a time away from your family. You won't be deployed overseas. You won't be on-call, you won't work weekends (depending on where you are), and you won't be expected to do a residency where you already have a professional degree but are expected to work long hours for shit pay.
You won't be scrubbing toilets, organizing files, entering data, or be treated like you're a nobody by other people in your company and their clients. You won't question whether your work is entirely pointless. You won't work on commission where your salary varies a ton. You won't be working in a dangerous job like law enforcement and some construction jobs. You won't have to retire by 40 because it's a physically demanding job or have to face being unpaid for a month because you hurt your back on the weekend and now can't do your job during the week. You won't have to constantly find new clients or renew contracts for old ones to keep your business afloat. You won't have to stare at a spreadsheet all day doing the exact same thing as the day before. You won't have to sit through endless middle management meetings. You won't have to do budgets, review budgets, approve or disapprove of budget items. You won't have to work swing shift, or 24-hour shifts, or work a revolving schedule (like 5 days on, 3 off) that makes your personal life almost impossible to plan. Your daily duties do not involve collections calls or angry customers. You are not in danger of being shitcanned at any time, including within your first year or two, due to "restructuring" or any other whim of a new executive or senior manager.
I could really go on for several more paragraphs. Yeah, practicing law is work, but a lot of people doing it have very little perspective on how much other jobs suck. My job is tolerable. I don't dread going into the office. I don't get a sinking feeling in the pit of my stomach at 2 p.m. on Sundays. I do my shit, get treated like a professional, win some cases, make some clients happy, occasionally screw something up, but in any event I go about my business and nobody messes with me.