I find that the convenience in using Aldi Trolley is being offset with the inconvenience in finding Aldi trolley aisle to get the token/coin back. When I do find one, sometimes it is already staked with trolley from different supermarkets. Having said that, by not using Aldi's trolley, there is also an effort to get a trolley from other supermarket first.
Context: in the shopping centre that we go to, Aldi is where we get most of our groceries from and is closer to the carpark entrance. So we usually go to Aldi first before picking up other items from different stores (i.e. if the item not available at Aldi or if we want specific brand).
Google foxpop. Problem solved.