The presidential motorcade

This illustration (click for bigger) accompanied a recent article in The Atlantic explaining how the Secret Service protects the President.

It is a sorely underappreciated fact that both Bill Clinton and George W. Bush were the subjects of relatively close-call assassination attempts. During a speech Bush gave at Tbilisi’s Freedom Square in Georgia on May 10, 2005, an assailant threw a live grenade at the president... Luckily, the grenade fell more than 30 yards away from Bush, outside of its effective range, and it did not explode. The Secret Service had warned the president and his staff that it was not able to screen everyone within the standard range, and that as a result, he was potentially in danger. According to former administration officials, Bush insisted on giving the speech anyway.

Clinton’s brush with death was closer still, and his life may have been saved by a gut decision made by his detail leader... in 1996, President Clinton was in Manila for an Asia-Pacific Economic Cooperation summit, and had on his agenda a visit with a local official. He was running late, in a surly mood, and eager to get going. According to Gormley, just moments before the motorcade was about to move, agents using a special intelligence-gathering capacity—one that remains classified—picked up radio chatter mentioning the words wedding and bridge. Knowing well that wedding was often a code word for a terrorist hit, Merletti changed the route, which happened to include a bridge. Clinton was angry at the decision, which would cause further delay, but he did not override it. When agents arrived at the bridge, they indeed found explosives: had Clinton taken the prescribed route, he very likely would have been killed. (Within the past decade, the service has added an electronic-countermeasures vehicle— theoretically capable of jamming remotely controlled explosives—to the presidential protection package.) 

I understand the President needs protection and continuous/instantaneous communication with everyone.  But the full panoply of the motorcade gives me unpleasant associations with an "imperial" presidency.