The tower at the Sheraton World wasn't added until a remodel in 1999, it was all low-rise buildings before then, here are some old brochures:


Here's a closeup of the 1999 brochure announcing the brand-new tower:


Is it possible your trip was as late as 1999?

I checked my old Sheraton directories from 1992-1994, the chain only had five properties in Orlando in that period:
Walt Disney World Dolphin - has a tower, but not easily forgotten and no low-rise portion
Sheraton Lakeside Inn - a low-rise motel, now called the Maingate Lakeside Resort
Sheraton World Resort - which didn't have the tower yet, just low-rise wings
Sheraton Plaza Hotel at the Florida Mall - a high-rise connected to a mall, now called the Florida Hotel & Conference Center
Sheraton Orlando North Hotel - a low-rise that returned to Sheraton a few years back under the same name
Sheraton University Inn - a small 7-story motel, now the Holiday Inn Orlando East - UCF Area

None seem to match your description and dates.

The only hotel I know of with a tower that Sheraton operated in the Orlando/Disney World area prior to the tower wing of the Sheraton World opening in 1999 was the Sheraton Twin Towers. It originally opened in 1973 as the Sheraton-Towers Hotel. But it left Sheraton in 1988, eventually becoming a Radisson. It's now also a DoubleTree by Hilton, located directly across from Universal
Could this possibly be the hotel you mean? I know it's not on International Drive, like the Sheraton World was. As the name implies, it had two towers, but no low-rise guest wing, just a low-rise convention facilities building, as seen here: