Although, from a practical standpoint, when someone says they're going to "Target", or "McDonalds", it's immediately clear that they are speaking of the nearest retail outlet of that company, while Apple has multiple meanings (the store, the desktop computers, the mobile computers, the ecosystem, the famous watchband maker)*, so "I'm going to go to Apple" is a bit more ambiguous. "Target store" sounds redundant, as does "McDonalds restaurant", but I expect "Apple Store" will persist for quite a while in conversation.