Ab-so-lutely.
I wanted to be an RAF pilot, and I would have been a very good one, but my dreams were shattered aged 12. Life thereafter has just been a search for some other fullfilment not yet discovered.
Furthermore, on a beautiful warm summer's day, I can't just jump in the car and drive to say skafell pike for a walk. Similarly, I can't just jump on Eurostar and go to Paris for a bender on a Saturday night on a whim. If I wasn't diabetic, those sorts of things would need no preparation, no forethought, no other planning, nothing to carry.(except a bit of cash, credit-card, and passport for Paris).
The same applies to work, sitting in meetings and thining "**** I think I'm going hypo. how can I reach for another coffee and shove loads of sugar into it at this precise moment in time without looking an ****, the clients don't know I'm diabetic, and we just had a break 10 mins ago".
Having said that, I have worked on projects abroad ....Iraq (pre-wars), Saudi, Sudan, Oman, Israel, Greece (pre-EU(, Nigeria, Jamaice ....to name a few. So diabetes doesn't stop world travel, but it does impact spontaneous excursions and excludes one from some jobs.