The Pros and Cons of Volunteering in Organizing Workshop in High Prestigious Conference
There's a lot of work involved in organising workshops, but as the most junior member of the committee, you're not likely to be asked to take the lead on soliciting for sponsors and so on. There would probably be a lot of grunt work involved for a few days leading up to the workshop and perhaps scattered calls on your time here and there overall.

If organising a workshop prevented researchers from doing their primary research, I doubt that any researcher would volunteer for the job. Getting to meet leading researchers in your field on a personal basis is a 'Pro' that you shouldn't dismiss too quickly. You could end up discussing their pet theories while driving them around or asking them about your own research over lunch. Or you might be assigned to stack chairs and have to make your own opportunities.

The opportunities are there for the taking, and the time commitment shouldn't be onerous. It would be wise to ask previous committee members about their experience, especially about whether / how it impacted their research. You can also speak with the workshop chair about how much time you have available for the role, should you take it up. This would help you judge whether it is practical for you to volunteer in this instance.