Pretty much all doctors here (Canton Zurich) speak English, getting them to speak it is another matter. Given what your asking is like how long is a piece of string?, you don't know where you will live but are searching doctors? But if you can narrow it down a bit, then use
www.doktor.ch just enter a postcode and hey presto a list of doctors pops up. According to my Swiss wife it is accepted here to make an appointment (cost free) to interview the doctor before agreeing to join their practice. They are a business as well so when we last searched all but 1 actually phoned back (unheard of in Australia) to assess our needs and the "fit" into their practice ie your needs vs their available time and specialities.
Other points to consider:
How many doctors work in the practise? 2-3 is best, otherwise you end up in a place that is too busy or end up at a different practise when they are on holidays.
Parking or close to a train station.
Ask how big their range of medicines they carry - one of our doctors carries a good range so it saves a trip to the chemist and all goes straight to insurance, we have also called her for some things and picked them up from her letterbox!!
www.comparis.ch is a good starting point to compare health insurance.
There is a wealth of information on here and other swiss expat blog sites explaining health insurance and franchise or the "excess" fees before insurance starts to pay.
Doctors everwhere are a bit aloof and authoritarian, here they take it to another level!! but don't think for a minute that they are not caring and concerned. Our kids doctor is a classic example, great with the kids hates having to explain anything to us or answer our question but many times we have left with information he has reasearched for us knowing my son's problems without being asked e.g. your son is on these 3 medications the latest reaseach shows they are cancelling each other out or causing xyz, have you noticed these symptoms?
Keep looking until you find your perfect match.
The Swiss do not give help or information unless they are asked, if one does not have the speciality you are looking for, ask if they can reccomend someone else.
If you are not on private insurance find out if they (and the specialists they work with) operate out of public hospitals.