I've been running my diesel in 2WD for 3 years - its been a perfect car. It handles fine, just like any other FWD car.
The only benefit in converting a 4WD setup to 2WD is reliability - ie eliminating wind up causing damage to the car's transmission. It may only be 1 benefit - but it is potentially big one. In 4WD, if you don't test and keep an eye on your VCU and tyres you have the very real chance of killing your Freelander - the cost of repairs being more than the car's value. It may only be a couple of days with a tyre low on pressure, if you don't notice or realise what it is, then there's a big possibility of problems.
However, the 4WD transmission does not just give benefits when going off road. On-road traction on frosty winter days is much better in a 4WD than a 2WD.