I don't know how the ecstasy flows in Scotland, but MDA is said to be more visual than MDMA and also cheaper/easier to produce. It is possible that a large portion of the ecstasy where you live is MDA alone or mixed with MDMA. Another indication of MDA is the length of the duration of effects, which is slightly longer than that of MDMA. (4-8 hours according to Erowid)
Personally MDMA has only given me visual distortions such as trails, clouding, 'glows' to objects (especially where light is involved) and on really good pills nystagmus which makes my field of vision appear to jump, blur or even double temporarily. On higher doses I have noted minor closed eye visual patterning but not much else. Some people do appear to have more significant hallucinations with MDMA though and you just may be one of them. Why exactly I couldn't tell you, but I do know that a good deal of MDMA is metabolized into MDA and how much depends on the individuals metabolism.

The only 'true' hallucinogens I have done are 2C-E, mushrooms and DOC, which seems to be compared to acid a lot. I had fun and everything but the DOC really fucked me up, for a very long time. I didn't even begin to feel like I was back in the 'real' world for 18+ hours after I started to feel the effects.

I like ecstasy because when I am rolling I know that I am still on planet earth, and it is absolutely fucking wonderful.