Surely some of it is down to jealousy.
Maybe in the 1980s or very, very early 90s. Not now. They are not 'special' any more. Overpriced 'normal car'. I certainly have no desire to own one at the current prices.
Not wishing to try and convert people, just my view on the subject as I own an Omega and a BMW. The indicators work on both of them.

I also still like the E39 as mentioned by the OP.

Although there are many who are adamant that they will never own a BMW, a lot of the cost of higher spec bmw's is in the dash.
You have google for general searching, tv, the ability to send info to the car from a laptop or iPad and the SOS function in the telecoms unit. Music can be downloaded to the hard-drive so no need for disc's or iPod as it holds thousands of tunes.
You can set the heater to come on at a time of your choice so no need to defrost on cold mornings. The same with cooling in summer. As on many other manufacturers cars, the navigation is 'live' and at the touch of a button you can request data sent to the car. Any info on the dash can be read out to you over the car speakers, such as texts, the news or weather. If you have an accident, the cars sensors assess the severity and await a call to be made from the car. If no call is made, the call centre dials the car to check you are ok. If there is no response they call emergency services, giving them your position (thankfully not tested this yet). The SOS button dials emergency services number for you and is better than using your mobile as they can immediately pin-point the cars position rather than tracking your phone.
This all comes at a price in the build, whether you choose to use it or not.
Advantages of my 3.2 omega ---> it's relatively quick, it tows the van well and is very comfy on a long run and is well cushioned from road imperfections.
Disadvantage is obviously the fuel it consumes.
Advantages of my 330d ---> regardless of what people think, it is much quicker than my omega, has loads of useful media toys and for a three litre diesel is very economical. 50mpg from a car limited to 155mph surely can't be sniffed at.
Disadvantage is feeling every pot hole through 255x35x19's and rather harsh suspension set-up on M Sports and obviously the cost.
Oh, and being labelled a knob because I drive one.

Sorry it was a long and boring reply.
