I did juice plus for about 2 years... Id agree it's basically a very expensive vitamin tablet (and vitamin tablets may or may not work according to research). If say there are definitely better ways to spend your money.
I know everyone is different, but I can't see how vegetables would suddenly be bad for you, if you have been able to eat them when you had a colon. Digestion occurs in the upper end of the digestive tract (the bits you still have!) Cutting a bit of water absorbing colon out wouldn't affect that.
What having a colon might do is mask symptoms, so if a certain food increased your transit time, you would still have a colon to slow and soak more fluid. For example I now get ill of I eat apples or avocados, but I never noticed this when I had a colon. I noticed that both the foods contain polyolys, I then ate other polyolys and also felt Ill.
I'm summary have a look at the scd diet. As for sugar, I'm the same, the RDA for sugar is 35g, of I stay below that I seem ok. Also I find it's best not to eat sugar immediately after a meal (encourages fermentation)
Hth