Unfortunately, they also have plenty of low-quality venues that dilute the discoverability of the high-quality ones. Some orgs (Usenix for instance) hold to at least a decent standard across nearly all their research conferences, so I can better gauge the quality of a paper in a field I'm less familiar with based on whether it was accepted to a conference in that org. When it comes to IEEE, it seems like they'll let any low-quality journal or conference spring up with their brand as long as it brings in the cash.