If you're in line for Space Mountain today, as you go to the part that overlooks Tomorrowland, you'll see that trapezoid shaped section towards the balcony that people like to lean on.. That's where the old speed ramps came up to for the line.
There are also the speed ramps that came up to the 2nd level of starcade. This just had more arcade on the 2nd level, however back then more of the glass was see-through and the doors were usually open and people even casually went in and looked around while they were in line a lot.
Ok, well then my memory is a little fuzzy. It could have been during Tomorrowland 98 construction or something. That could explain why the entrance was different. I remember being confused, because it never used to enter there.
Perhaps your took the Starcade speedramp when they were first taking out the original speedramp, but have not yet opened up the current walking entrance yet. So they diverted everyone over to the Starcade ramps.. I vaguely remember that too.