On what regards coastal cruisers most just turn on the engine when they have to go dead upwind and when there is waves they let the main on and motorsail for a better wind angle.
There are very few that really like to beat against the wind. Its is slow, even if you go fast and many times uncomfortable and that's why most modern production cruisers are not optimized upwind sailing boats. The large majority of cruisers are coastal cruisers.
Even among production cruisers you can have remarkable differences and on the same model the depth of the keel is an important factor. The same boat with a 1.70m keel and with a 2.25m keel will go very differently against the wind. The quality of the sails and its condition is also important.
some have already given practical examples: ZZ4GTA had already gave an example of an extremely good pointing boat, the America cup monohulls, withapparent angles of 20º and and Actual tacking angles of 60º.
As Mark said on typical modern cruising boat the angles are most of the time around 110 degrees. A good one can do 100º and only a performance cruiser with very good pointing ability will make about 90º. There are many boats that will make more than 110º
Regarding cruising the difference of a boat capable of making around 90º and one capable of making 110º is a huge one, providing one really sails and don't just use the engine
The angles a boat can make will depend on the wind (more wind, closer you can get, till a point) and on the wave and sea condition. To get an idea you can get a look at an ORCI file. Here you have one of a very good performance cruiser, the First 40. These numbers are with optimal conditions, no waves, excellent sails and a very well sailed boat. These perfect speeds are very difficult to reach by a cruiser in normal conditions even if one can get close.
You can see that they point to each wind speed the best beat angle (true wind) that can go from 44º with 6K wind to 36.6º with 16K wind.
A Benetau Oceanis 393 (1.93 draft), in perfect conditions with racing sails can go from 46.5º with 6K wind till 40.6º with 16K wind.
That does not seem much but the First is more narrow, will knife better through the waves and in reality the results with be farther apart than the ones that consider flat water, specially in what concerns medium and high winds (bigger waves).
Also, even in flat water the speeds made good (the real speed considering a straight line against the wind and not the speed the boat is making over the water against the wind) are very different. With 6K wind The Benetau Oceanis 93 will be making 2.98K and the First 40 3.69K. With 16K wind the Oceanis is making 4.98K and the First 5.81.
As I have said that is in ideal conditions that we rarely find in reality (no waves) and as I have said with waves we will have a bigger difference in what regards to sail with 16K because there are normally waves with 16K wind.
Anyway that means that dead upwind in perfect conditions the Oceanis 393 will make with 6K wind 71.5nm in 24 hours and the First 40 88.6. With 16k wind and flat water the Oceanis will make 119.5nm and the First 139.2.
The Oceanis 393 is a well designed modern boat and even if there are some old boats that can have a better performance (specially with 16k wind) many will have a worse performance and in some the difference will be as big or bigger than the difference between the Oceanis and the First.
So you can get a idea about the subject in what concerns different boat performances upwind