Special effects in 90's movies
Oh, but you're very wrong that in 1994 CGI wasn't around. The very film you use as an example had a very extensive VFX and CGI credits list.

In 1993, Flame was already around being used on Silicon Graphics stations. It evolved into the software currently owned by Autodesk, and still one of the mostly used VFX suites in Hollywood productions.

One year before that, Jurassic Park was already in post production, with lots of CGI and software specially made for that film.

CGI has been around since the 70's