URLs are long and tagged with parameters for SEM purposes, not SEO. Long URLs that are spidered by Google are usually considered bad from an SEO perspective because they're not "pretty" URLs. There's a lot of incorrect information being passed around on this thread.

All the parameters you see specify campaign variables to help marketers track their campaigns. As for privacy, these parameters don't reveal user behavior on a site. It's only when it's connected to Google Analytics that is placed ON the site that the campaign data is then connected to site data. Long URLs have no adverse affect on the user browsing experience and URL shorteners do a great job of hiding them so removing those parameters simply serves to screw over marketing people that have spent time and money crafting their campaigns and gathering valuable data.

In regards to making it harder to detect duplicate URLs...really??? It's that hard to strip our everything before parameters?