Working hard is important to be successful in any job. Working harder than your peers can often lead to promotions or a raise. But it is very important to have a good work life balance. Make sure you have time to disconnect from work and have time to enjoy your life.
I see pro-active and workaholic as two separate characters. Pro-active is dependent on the nature of job and it all depends on your manager and organisation how they would want to define it to you. Not being always pro-active is appreciated. Workaholic is personal choice , you have to decide if you are committed only to your organisation or do you want to keep a good balance. I would go for the later , we should be working but not becoming workaholic , there is also life outside work.
All the best in your job and career
Being proactive is a good thing, as it shows that your not afraid of getting the job done. You don't have to be a workaholic to be proactive. Being a workaholic means you have no time for yourself, your health, friends and family. These things are important if you want to ensure you live a happier life. You can be passionate about your work but it should not consume your whole life.
Being proactive and being someone that enjoys work and wants to get the job done are two great qualities to have.
Be mindful of burn out, and make sure to take time for yourself too! Use these qualities to be proactive about taking time off, and working hard towards being your best self in more than just at work.
Keep working hard!