Why would conventioneers impact your stay anymore than regular park going guests? If anything, they're a benefit, since they usually are in meetings instead of riding buses. And they are adults networking with each other in tge conference center during the day, so unlikely to be hogging the loungers at the pools.
Now, in the late afternoons or evenings you may see a lot of them in the resort bars and TS restaurants. Outside of el Centro, the only time I really noticed them was in the mornings. I'd be relaxing with my coffee on my favourite bench looking at the lake and they'd be going past me in their business casual attire, looking serious and,well, business like, and pulling their briefcase on wheels behind them. Poor guys.